IT might work out, it might blow up in Obama’s face (he’ll be retired but hsi supporters will reap the benefits and pay the price). Remember that anything that requires a change in law won’t be happening so sanctions that are controlled by statutes aren’t affected unless Obama can get a majority in Congress rather than enough votes to override a veto banning the agreement.
As it is the agreement only stays in effect until Jan. 21, 2017.
And if it results in Iran helping to crush Islamic State, it will help the Democrats. If it leads to a war between Iran and America’s allies in the region, it will make the Democrats look like fools. Right now Islamic State is more to be worried about than Iran.