democrat

Election...The media sets up on the risers before Democrat Tom Wolf's rally in the Utz Arena of the York Expo Center in York, Pa. on Tuesday, Nov. 4, 2014. (AP Photo/York Daily Record, Jason Plotkin)

Jason Plotkin/AP

The media sets up on the risers before Democrat Tom Wolf’s rally in the Utz Arena of the York Expo Center in York Pennsylvania. 

 Iowa Senate Candidate Bruce Braley Campaigns Ahead Of Midterm Elections

Chip Somodevilla/Getty Images

Democratic US Senate candidate Bruce Braley (L) hugs volunteer Pat Halferty during a campaign stop at the Lynn Count Democratic HQ on November 3 in Cedar Rapids, Iowa. Polls put Braley neck-and-neck with Republican Joni Ernst and the Iowa result could decide which party controls the Senate

President Barack Obama, accompanied by Democratic Massachusetts Senate candidate, Rep. Ed Markey, right, talk with patrons at Charlie's Sandwich Shoppe in Boston, Wednesday, June 12, 2013. Obama traveled to Boston to campaign for Markey in his campaign.

Evan Vucci/AP

President Barack Obama, accompanied by Democratic Massachusetts Senate candidate, Rep. Ed Markey, right, talk with patrons at Charlie’s Sandwich Shoppe in Boston on Wednesday. Obama traveled to Boston to campaign for Markey in his campaign.