1. Tracking Romney’s ad buys:

Look at the remaining Republican primary calendar dates and the candidates’ respective strengths and do the math: There are certain states where Rick Santorum and Newt Gingrich seem to have the best chance later this winter and spring (assuming one or both stay in the race) of winning enough delegates to deny Mitt Romney the majority he needs to lock up the nomination before the convention. These include Georgia (76 delegates, Super Tuesday – Mar. 6), Ohio (66 delegates, Super Tuesday) Tennessee (58 delegates, Super Tuesday), Alabama (50 delegates on Mar. 13), Texas (a huge 155 delegates on Apr. 3), Pennsylvania (72 delegates on Apr. 24), and California (an enormous 172 delegates on June 5).