Are things getting better for Senate Democrats? Certainly many of the better (more reliable) statistical models seem to suggest they are. … The conventional wisdom also appears to have shifted over the past week. What, if anything, has happened to cause this shift?
The most significant reason seems to be that in this year’s competitive Senate races in purple states—those where either Barack Obama or Mitt Romney won by narrow margins—Democrats are, for the most part, holding their own or even improving their odds. CONT.
Charlie Cook