Democrats shouldn't be giving up this easy. To be a 2nd President, Obama only needs 270, but to be a good 2nd term President, he needs at least 300 because he needs to pick up the House along the way if he has any hope of getting anything done.
I agree that Obama shouldn't be conceding Florida just because he's within the margin of error; that's a bit silly of an argument for everyone to be making here.
However, no matter how well Obama does, the numerous post-redistricting GOP gerrymanders across the country still make retaking the House an extremely difficult proposition.
True but Florida is one of the few states where Obama could benefit House Dem candidates by driving up turnout in competitive districts. There's not much he can do in Virginia, North Carolina, or Ohio House districts by comparison.