Obama has started wars.
He never served.
Is Obama a chickenhawk?
He was never asked to. A proper chickenhawk has to have actively avoided military service. To be really on-target with the appellation, he has to have approved of the very war in which he avoided service. In fact, it may be the term can't properly apply to anyone who came of age since we stopped drafting.
George W. Bush is a chickenhawk. Bill Clinton is not; he's a chickendove (if there is such a thing). Barack Obama is neither. I don't know Romney's views on Vietnam, but he's old enough to be a chickenhawk and fulfills at least one of the criteria.
If we were going to apply the label to any president who commands in war while never having served, we'd have to condemn Abraham Lincoln.