intro: The magic number for Republicans in 2012 is four. The GOP has to pick up just four Senate seats order to gain control of the upper chamber, making this the fourth straight election where the balance of congressional power lies in just a handful of races. And while the election is still more than a year away, the battle lines are already starting to be drawn.
A total of 33 seats will be up for grabs in the 2012 election, 23 of which are held by Democrats. Republicans will have open...Full Story