Britain's Labour Party leader Ed Miliband, left, poses for a picture at Nuneaton railway station before unveiling his party's new National Health Service campaign posters in Nuneaton central England during his General Election campaign tour Thursday April 23, 2015. Britain's most unpredictable general election in decades is Thursday, May 7, with polls showing the two biggest parties Labour and the Conservatives running in a virtual dead heat. The election could decide issues such as whether Britain will remain a member of the European Union, whether it will close its doors to immigrants and whether it will continue with the austerity programs. (Stefan Rousseau/PA via AP) UNITED KINGDOM OUT (The Associated Press)
LONDON – Once, election campaigning meant knocking on doors, organizing meetings and licking stamps. Now it also includes honing hashtags, rallying retweets and clicking "like."