Thirty Senators signed a letter to George W. Bush stating that the administration doesn't have the authority to declare war on Iran without Congressional approval. Clinton, who voted for the Kyl-Lieberman amendment naming the Iranian Revolutionary Guards (part of the Iranian military) as a terrorist organization, signed the letter. Obama, who has been bitching to the top of the sky about Clinton voting for the amendment, even though he himself didn't vote against it and even though he co-sponsored a very, very similar bill earlier, didn't. The Huffington Post asked his office why he didn't vote for it and it cited the Kyl-Lieberman amendment...which Hillary voted for. His office said that the resolution, which explicitly says that Bush doesn't have the right to go to war without Congressional approval, didn't go far enough to correct the damage done by the Kyl-Lieberman amendment....that Hillary voted for.
Well despite voting for the Kyl-Lieberman amendment Hillary or her staff seemed to think it was a good idea for her to sign this letter, while Obama is missing in action.
Obama has been the darling of the netroots, being covered as if he could do no wrong, but from my perspective it seems like Obama is taking the unexpected support from the internet community and using it to advance his own agenda, which seems to include lying about how against war with Iran he is in order to beat Clinton in the primaries.