The presidential tug of war over Missouri continues, with presumptive Democratic nominee Barack Obama returning to the state on Monday.

He’s to be in Independence, hometown of favorite son and former President Harry S Truman.

In fact, the morning campaign event will be at the Truman Memorial Building. No more public details are available, other than doors open to the public at 9 a.m.

Free tickets are required, the campaign says, and are available at Obama’s campaign Web site.

The visit comes less than three weeks after he was in St. Louis, and less than two weeks after his Republican rival — Sen. John McCain — was in Missouri.

UPDATE:

BY THE WAY, rumor has it — from a reliable source — that McCain will be back in Missouri, and possibly in the St. Louis area, VERY soon!!!