National Journal‘s race rankings for this year’s Senate contests (updated last week) tell an interesting story.  Not only is Rick “Look at All the WMDs!” Santorum getting pummeled by his challenger, Bob Casey, Jr. (the Journal doubts he is losing by Quinnipiac’s 18 point margin, but he is definitely losing big), but Conrad Burns in Montana and Jim Talent in Missouri are also struggling.  According to the Journal, Burns’ weakness is even more worrisome to the GOP poobahs than Santorum’s meltdown.  I had noted earlier this year that Talent was in trouble and he continues to lag behind.  Ohio’s Mike “What Constitution?” DeWine remains at risk, given the disaster that is the Ohio GOP these days, but in my view he probably continues to benefit from the Ohio Dems’ foolish decision to run antiwar candidate Paul Hackett out of the race in favour of Sherrod Brown.