Governor Carlson says the recent governor's campaign shows it's time for Minnesota to re-think its election system. Carlson says the September primary should be moved up to May -- and he says the state should add a SECOND primary in the fall to narrow down the field of candidates. Minnesota Public Radio's Martin Kaste reports: Governor Carlson says the fact that Jesse Ventura won the governor's race with only 37 percent of the vote is evidence that Minnesota is moving away from the traditional two-party-system. In a Veterans' Day speech to the Bloomington Rotaryt club, he said he was worried that MN elections will become more and more fractious: ((If we're going to have 8 people and several dif pol parties -- we now have 4 major parties, with add of taxpayers' party -- we