Would Obama Side With Iran?

Baron Bodissey of Gates of Vienna reports that Iran has tested a nuclear bomb. He quotes "Israel National News":

"(IsraelNN.com) A weekend 5.0 Richter earthquake in Iran was actually a nuclear bomb test, says an Iranian nuclear scientist claiming to be working on the project."

My question on this is whether Barack Obama would side with Iran in the event of a nuclear strike on Israel. Who's giving odds on this? And who's willing to compare the odds with a President McCain's?