Those good folks have no use for either Obama or the GOP, but I agree with you, they'll hurt Obama more than the other side, because they'll peel his voters away from him, at the same time energizing the Republican base without peeling any . . .
uh, ya know, CU4, there just might, might be, some GOP who are starting to see the light, and might also be peeled away by these good folks.
Although, on balance, their "peel-away" potential now seems to be a lot greater on the Democratic side of the line.