John McCain and his wife Cindy celebrate the Arizona senator's victory in the New Hampshire primary in January 2008. Just months prior to the primary, McCain's poll numbers were sinking, his staff was in disarray and his fundraising effort was weak. Many political experts thought his campaign was hopeless – and then he won in New Hampshire.

"Tonight we sure showed 'em what a comeback looks like," McCain said over cheers of “Mac is back!” on the evening of his victory.

(© AP Images)