campaign

Former mayor of London and Vote Leave campaigner Boris Johnson wears protective equipment as he visits Reid Steel during a campaign stop in Christchurch

Darren Staples/Reuters

Former mayor of London and Vote Leave campaigner Boris Johnson wears protective equipment as he visits Reid Steel during a campaign stop in
Christchurch, Britain, on Thursday

Presidential Candidate Hillary Clinton Holds Kentucky Campaign Rally...An attendee wears campaign buttons before the start of an event for Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, not pictured, in Louisville, Kentucky, U.S., on Tuesday, May 10, 2016. Clinton said she sees "a great role" for Bernie Sanders and his supporters in a "unified party," even as she said she welcomed Republicans who are not supporting presumptive nominee Donald Trump. Photographer: Luke Sharrett/Bloomberg

Luke Sharrett/Bloomberg

An attendee wears campaign buttons before the start of an event for Hillary Clinton, former Secretary of State and 2016 Democratic presidential candidate, in Louisville, Kentucky 

Presidential Candidate Bernie Sanders Holds Atlantic City Campaign Rally...An attendee with a campaign sticker on her phone takes video as Senator Bernie Sanders, an independent from Vermont and 2016 Democratic presidential candidate, not pictured, speaks during a rally at Boardwalk Hall in Atlantic City, New Jersey, U.S., on Monday, May 9, 2016. Atlantic City, the struggling casino hub weeks away from bankruptcy absent state action that has been hit hard by the decline of its dominant industry, is a fitting platform for Sanders populist message on how corporations reap profits while urban areas are neglected. Photographer: Andrew Harrer/Bloomberg

Andrew Harrer/Bloomberg

An attendee with a campaign sticker on her phone takes video as Senator Bernie Sanders as he speaks during a rally at Boardwalk Hall in Atlantic City, New Jersey

Carlos Barria/Reuters

Republican U.S. presidential candidate Donald Trump’s hand is seen as he reacts during a campaign event in Harrisburg, Pennsylvania

Hillary Clinton...Democratic presidential candidate Hillary Clinton arrives at a campaign stop, Wednesday, April 20, 2016, in Philadelphia. (AP Photo/Matt Rourke)

Matt Rourke/AP

Democratic presidential candidate Hillary Clinton arrives at a campaign stop in Philadelphia 

Brian Snyder/Reuters

U.S. Democratic presidential candidate and U.S. Senator Bernie Sanders takes the stage at a campaign rally in Binghamton, New York

U.S. Republican presidential candidate Donald Trump reacts to supporters as he arrives to a campaign event in Radford...U.S. Republican presidential candidate Donald Trump reacts to supporters as he arrives to a campaign event in Radford, Virginia February 29, 2016. REUTERS/Chris Keane

Chris Keane/Reuters

U.S. Republican presidential candidate Donald Trump reacts to supporters as he arrives to a campaign event in Radford, Virginia

Democratic Presidential Candidates Hillary Clinton And Bernie Sanders Debate In Durham, New Hampshire...DURHAM, NH - FEBRUARY 04:  Democratic presidential candidates former Secretary of State Hillary Clinton walks on stage during a break as she debates with U.S. Sen. Bernie Sanders (I-VT) during their MSNBC Democratic Candidates Debate at the University of New Hampshire on February 4, 2016 in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries.  (Photo by Justin Sullivan/Getty Images)

Justin Sullivan/Getty

Democratic presidential candidate Hillary Clinton walks on stage during a break as she debates with U.S. Sen. Bernie Sanders (I-VT) during their MSNBC Democratic Candidates Debate at the University of New Hampshire in Durham, New Hampshire. This is the final debate for the Democratic candidates before the New Hampshire primaries

A child sits on the ground and listens to U.S. Democratic presidential candidate Hillary Clinton speak to supporters during a campaign rally in Manchester, New Hampshire...A child sits on the ground and listens to U.S. Democratic presidential candidate Hillary Clinton speak to supporters during a campaign rally in Manchester, New Hampshire, February 3, 2016. REUTERS/Carlo Allegri

Carlo Allegri/Reuters

A child sits on the ground and listens to U.S. Democratic presidential candidate Hillary Clinton speak to supporters during a campaign rally in Manchester, New Hampshire

Students and a women police officer dance as they take part in "One Billion Rising" campaign on a street in Chandigarh...Students and a women police officer (C) dance as they take part in "One Billion Rising" campaign on a street in Chandigarh, India, February 2, 2016. One Billion Rising is a global coordinated campaign aimed to call for an end to violence against women and girls, according to its organisers. REUTERS/Ajay Verma

Ajay Verma/Reuters

Students and a women police officer dance as they take part in “One Billion Rising” campaign on a street in Chandigarh, India. One Billion Rising is a global coordinated campaign aimed to call for an end to violence against women and girls, according to its organisers

Myanmar opposition leader Aung San Suu Kyi  greets supporters and Shan ethnic minorities on arrival at Tachileik airport in Shan State to campaign for National League for Democracy (NLD) on October 21, 2015.  European Union observers will be given access to voting on military bases for next month's Myanmar election, an official said, a move to bolster oversight of a poll billed as the country's fairest in decades.

Romeo Gacad/AFP

Myanmar opposition leader Aung San Suu Kyi greets supporters and Shan ethnic minorities on arrival at Tachileik airport in Shan State to campaign for National League for Democracy (NLD) on Wednesday

Democratic U.S. presidential candidate Hillary Clinton arrives with Nevada State Assemblyman Nelson Araujo to purchase ice cream between campaign events in North Las Vegas

David Becker/Reuters

Democratic U.S. presidential candidate Hillary Clinton (L) arrives with Nevada State Assemblyman Nelson Araujo to purchase ice cream between campaign events in North Las Vegas, Nevada.

Kayan ethnic women wait for the arrival of National League for Democracy chairperson Aung San Suu Kyi during an election campaign rally in Demoso, Myanmar's Kayah State on Thursday

Ye Aung Thu/AFP

Kayan ethnic women wait for the arrival of National League for Democracy chairperson Aung San Suu Kyi during an election campaign rally in Demoso, Myanmar’s Kayah State on Thursday

UK Independence Party (UKIP) leader Nige...UK Independence Party (UKIP) leader Nigel Farage covers his ears as he campaigns in Ramsgate in south east England on May 6, 2015, on the eve of a general election in Britain. Britain's political leaders launched their last day of campaigning Wednesday for the most unpredictable election in living memory which could yield no clear winner and weeks of haggling over the next government. AFP PHOTO/ BEN STANSALLBEN STANSALL/AFP/Getty Images

Ben Stansall/AFP/Getty

UK Independence Party (UKIP) leader Nigel Farage reads a leaflet given to him by an anti-UKIP protester as he campaigns in Ramsgate in south east England on the eve of a general election in Britain.

Britain's Prime Minister David Cameron walks back onto his Conservative Party campaign bus after a factory visit whilst campaigning in Pendle in northern England, Britain...Britain's Prime Minister David Cameron walks back onto his Conservative Party campaign bus after a factory visit whilst campaigning in Pendle in northern England, Britain, May 1, 2015. REUTERS/Toby Melville

Toby Melville/Reuters

Britain’s Prime Minister David Cameron walks back onto his Conservative Party campaign bus after a factory visit whilst campaigning in Pendle in northern England 

Nicola Sturgeon, the leader of the Scottish National Party, launches her party's final poster at a campaign event in Leith Walk Edinburgh, Scotland...Nicola Sturgeon, the leader of the Scottish National Party, launches her party's final poster at a campaign event in Leith Walk Edinburgh, Scotland, April 30, 2015. REUTERS/Russell Cheyne

Russell Cheyne/Reuters

Nicola Sturgeon, the leader of the Scottish National Party, launches her party’s final poster at a campaign event in Leith Walk Edinburgh, Scotland 

Nick Clegg Visits A West Country School With His Wife...CHIPPENHAM, ENGLAND - APRIL 29:  Deputy Prime Minister Nick Clegg (C) and his wife Miriam Gonzalez Durantez help make a crumble at Ivy Lane Primary School as he canvasses with local Liberal Democrat candidate for Chippenham Duncan Hames (R) on April 29, 2015 in Chippenham, England. As the campaign enters the final days, the country's political parties are stepping up the campaign to appeal for votes from the indecided electorate.  (Photo by Matt Cardy/Getty Images)

Matt Cardy/Getty

Deputy Prime Minister Nick Clegg and his wife Miriam Gonzalez Durantez help make a crumble at Ivy Lane Primary School as he canvasses with local Liberal Democrat candidate for Chippenham Duncan Hames on Wednesday in Chippenham, England 

A child of a party activist waits for Britain's Prime Minister David Cameron to deliver a speech at a regional campaign launch in Penzance on Thursday in Penzance, England. Britain goes to the polls in a General Election on May 7

Toby Melville/Reuters

A child of a party activist waits for Britain’s Prime Minister David Cameron to deliver a speech at a regional campaign launch in Penzance on Thursday in Penzance, England

A dog and supporters wait for the arrival of Labour Party leader Ed Miliband in Crouch End, north London as part of his General Election campaign tour.

Stefan Rousseau/PA

A dog and Labour supporters wait for the arrival of party leader Ed Miliband in Crouch End, north London as part of his general election campaign tour

The Labour Party Launch Their 2015 General Election Campaign   ***BESTPIX***...LONDON, ENGLAND - MARCH 27:  Ed Miliband, leader of the Labour Party, arrives at the launch of his political party's general election campaign at the ArcelorMittal Orbit at Olympic Park on March 27, 2015 in London, England. Speaking before Monday's official start of campaigns for the May 7 general election, when Parliament is dissolved, Mr Milliband pledged to prevent further privatisation of the National Health Service.  (Photo by Rob Stothard/Getty Images)   ***BESTPIX***

Rob Stothard/Getty

Ed Miliband, leader of the Labour Party, arrives at the launch of his political party’s general election campaign at the ArcelorMittal Orbit at Olympic Park in London, England