Neither Biden nor Obama believe what they say when addressing AIPAC. The fact is (too many people tend to reject facts) that Israel serves U.S. interests in the ME. On the other hand Israel's service fees are high and since the U.S. is broke it is unlikely that we will be able to afford to maintain Israel in our employ much longer. In the meantime the Democratic and Republican parties vie for the support of Jewish political power in the U.S. in order to maintain control of the White House and Congress. They will say anything to gain the support of AIPAC and other Jewish organizations.
4 UN peacekeepers injured in Sinai and taken to hospital in south Israel (Haaretz)
from the article: Biden at AIPAC conference: Obama is not bluffing on Iran