"I will do everything in my power to prevent Iran from obtaining a nuclear weapon. Everything in my power. Everything."
Note how he emphasizes "everything", which of course means attacking Iran militarily. He goes on and on about all the steps he will take to force Iran to do his bidding.
Obama is not a change, he is just more of the same. Iran is no more of a threat to the United States than Iraq was. Obama's views on foreign policy will continue to have the United States interfering in the affairs of other nations. This in turn will lead us into more wars, more billions wasted and more dead and wounded young Americans.
Obama is pandering to AIPAC and the pro Israel lobby. The United States should stay out of the affairs of other countries entirely.