My guess is that Obama sees ISIS as undoing the historical wrong of British partitioning the ME back in the last century. I doubt he’s a fan of ISIS but I guarantee that somewhere in his leftist brain he sees anti-colonialist justice in what ISIS is doing. That’s why he has no enthusiasm to do much about it.
I think Obama is a big fan of ISIS because they are establishing the Caliphate.
Wait til Baghdad falls and IS pushs into Saudi Arabia. Can Iran hold them back? Maybe, but then again, maybe Iran is over streached. This might be the last fight between these two branches of Islam—One side must win, the other lose. This might be why Iran wants nukes? One big win and IS is well on the way to becoming the dominate power in the Middle East.