What do you want to do instead? A preemptive attack on the Iranians? Do you think it is a better solution? Do you want to force a war that, even if you "win" it at the end, would make several Israeli causalities and cause an unpredictable turmoil on the whole Middle-east? What if they destroy part of an Israeli city, what if hundreds Israelis die, what if the whole middle east turn against Israel at once (Turkey and Egypt are one small step from it), don't you care about this too? I think the situation is just not that simple. For me the Obama administration supports fully the Jewish state of Israel. They just have a different approach than you on how to do it.
Preliminary report: Palestinian stabs man near Damascus Gate, Jerusalem (Haaretz)