Britain's Prime Minister David Cameron leaves after his live televised interview in west London, Thursday March 26, 2015. Conservative leader Cameron went first in the show Thursday night, facing harsh questions from prominent TV journalist Jeremy Paxman. Miliband, the Labour Party leader, was set to follow, they weren't expected to share a stage at the studio. (AP Photo/Stefan Rousseau, Pool) (The Associated Press)
LONDON – Prime Minister David Cameron says Britain's election campaign is on a knife edge as he rallies his Conservative party ahead of the close-fought race.