The American Research Group poll last week that showed Obama even with Clinton was probably an outlier. Still, the drop this week is precipitous:

First poll of Pennsylvania voters post-”bitter” comments shows Obama taking a hit. The American Research Group had him and Clinton neck-and-neck with 45 percent each in its April 5-6 survey. The group’s April 11-13 poll has Obama at 37 percent to Clinton’s 57 percent.