WASHINGTON -- Once assured of victory on friendly turf, Mitt Romney faces a potentially devastating loss of his home state of Michigan to Rick Santorum, which could upend the campaign for the Republican presidential nomination.
Romney, the son of a popular former Michigan governor and a onetime Detroit auto executive, finds himself trailing Santorum in one of two states that vote Feb. 28. The other is Arizona, but Santorum's concentrating most on Michigan. A Romney loss in Michigan could weaken him going into the 10 "Super Tuesday" states that vote on March 6 and throw the race wide open.






