David Plouffe

Tim Bradshaw

It’s renowned as the most digitally savvy election campaign yet. The story of how Barack Obama used social media to build grassroots support has become the stuff of social-media legend.

But when David Plouffe, Obama’s campaign manager, took to the stage at the Cannes Lions  International Advertising Festival today, the surprising message for marketers was to keep  it “old school”: email and TV are still critically important.