VANDALIA, Ohio (AP) — Ohio has emerged as the presidential race's undisputed focus. Barack Obama and Mitt Romney are making multiple stops this week alone in a state that's trending toward the president, endangering Romney's White House hopes.

The popularity of Obama's auto industry bailout, and a better-than-average local economy, are undermining Romney's call for Ohioans to return to their GOP-leaning ways, which were crucial to George W. Bush's two elections. Ohio has 18 electoral votes, seventh most in the nation, and no Republican has won the White House without carrying it.

Romney is scrambling to reverse the polls that show Obama ahead. On Tuesday, he made the first of his four planned Ohio stops this week, joining his running mate, Rep. Paul Ryan, for a rally near Dayton. On Wednesday, Obama will visit the college towns of Kent and Bowling Green, and Romney's bus tour will stop in the Columbus, Cleveland and Toledo areas.