More likely - in an election with important consequences for everything from the war in Afghanistan to the global economy - there will be no clear winner but an unprecedented boost for the Liberal Democrats and their leader Nick Clegg.
All three party leaders, accompanied by their wives, cast their ballots on Thursday morning. Earlier, Britain's tabloids had pulled the trigger with the Daily Mirror running a picture of Cameron along with the words, "Prime Minister? Really?" The Sun, meanwhile, superimposed Cameron's face onto President Barack Obama's technicolor poster that read, "Hope."
Image: Britain's Prime Minister Gordon Brown holds the hand of his wife Sarah, as they leave a polling station in his constituency of North Queensferry, Scotland, after casting their votes in Britain's General Election on May 6, 2010.