Obama has no stances on anything... this doesn't surprise me at all.
He goes wherever the political wind blows, and is a walking, talking, gaffe machine. Just today he talked about the "bomb that fell on Pearl Harbor"... he was born in Hawaii, where Pearl Harbor is situated, and he doesn't even know basic American history related to it.
As for FISA itself, I love
this analysis by a blogger named Zombie about the Bush Administration vs. Al-Haramain case that kicked this debate off:
"Both sides were put into completely impossible positions: The government had to suppress a document which revealed Top Secret surveillance without actually admitting that it had conducted any surveillance; whereas Al-Haramain sought to revoke its designation as a terrorist organization by citing the very evidence (the information gathered during the surveillance) that suggested it was a terrorist organization. " -- Zombie (this was in 2007)