[cnn-photo-caption image= http://i.l.cnn.net/cnn/2008/POLITICS/01/14/michigan.primary/art.romney.2.mich.gi.jpg caption=" Former Massachusetts Gov. Mitt Romney is a Michigan native."](CNN) - The GOP presidential front-runners, locked in a tight race, are churning out ads and talking about the economy in a last-minute effort to win over Michigan voters before Tuesday's primary.
Former Massachusetts Gov. Mitt Romney has a narrow lead over Arizona Sen. John McCain, according to recent polls in Michigan.
Twenty-eight percent of people likely to vote in Tuesday's GOP primary said they supported Romney, compared with 26 percent for McCain.
Former Arkansas Gov. Mike Huckabee is in a close third with 17 percent, followed by former New York Mayor Rudy Giuliani and former Tennessee Sen. Fred Thompson with 5 percent each.
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