Barack Obama actually said...

"We want to review what we can do to that end but, unfortunately, there are indications that this conference will be just as deeply flawed."

"If those efforts fail, then the U.S. will not participate."

"I will do everything in my power to prevent Iran from obtaining a nuclear weapon--everything in my power to prevent Iran from obtaining a nuclear weapon--everything."

"while we should take no option, including military action, off the table, sustained and aggressive diplomacy combined with tough sanctions should be our primary means to prevent Iran from building nuc..."