John F. Kerry’s dead-last ranking in a poll of 2008 White House contenders has pundits saying he’s down for the count, but the beleaguered senator’s camp insists he’s still in the fight - and that’s no joke. The Quinnipiac University popularity rankings - based on interviews with 1,600 voters - come as Kerry struggles to recover from his “botched” attempt at humor when he made a reference to soldiers serving in Iraq. Kerry ranked 20th out of 20 politicians, lagging far behind a slew of Democrats expected to seek the party’s 2008 nomination. Tops among Democrats was Sen. Barack Obama...