He had a deferment to go on a mission, followed by student deferments. IIRC from a bio I read, each state could only give a certain number of deferments for Mormons to go on missions--had he lived in Utah at the time, he would have had trouble getting one. But as a Mormon in Michigan, there was not a long line to get them. He was in the draft lottery once his mission and student deferments were up, but he was never called.
Ok, so that article was written on June 7, and refers to a Monday rally before the CA primary. That means we are looking for video of Mitt Romney giving a speech in California on Monday June 4.
According to this, Romney wasn't in California on Monday June 4.