Barack Obama will end the five-month primary campaign Tuesday night at the site where the Republican National Convention will be held.

He and his wife will hold a rally at the Xcel Energy Center in St. Paul, symbolic staging apparently meant to signal that Obama will take the battle to the Republicans should he be the Democratic nominee.

It's also a signal that he thinks he has the nomination wrapped up, turning his back on the two pirmary states that vote Tuesday, Montana and South Dakota, and focusing instead on Minnesota, a general election battlefield state.