White House aides have said recently that the president will spend more time on the road, part of an effort to position him above the Washington fray and perhaps a signal that he intends to play a bigger role in helping candidates from his party who are facing tough contests.Since then, the President's national Strong Approval ratings have sunk even lower - averaging out at around 25% since early February.
What's the big deal about Strong Approval? Well, in a nationalized election, as the Democrats seem to be playing it, those who strongly approve of the President are most likely to go out and vote for him/Democrats.
Now consider that the President's strong approval rating at the time of his visit in New Jersey, a strongly blue state, was 13 points higher than it is now in national polling, and 12 points higher in Taxachusetts.
To put it simply, if sending Obama didn't work in New Jersey and Massachusetts, it definitely won't work most anywhere else.