When the ball dropped in Times Square on Jan. 1 of this year, more than half of the country disapproved of the job that President Obama was doing, according to Gallup. That boded poorly for the Democrats over the course of the year; presidential approval correlates to both how his party fares in the presidential race (even if he's not on the ticket) but also to the results of Senate races. An unpopular Obama suggested a less popular whoever-was-about-to-win-the-Democratic-nomination.
But over the course of the year, Obama's approval numbers changed -- quickly, and a lot. In Gallup's most recent weekly average, Obama is at 51-45 -- the exact opposite of where he was on Jan. 1 and a 12-point swing since then. He's been at 50 percent or higher in every week since March 1, save one.