(Brian Snyder/Reuters)

Mitt Romney is trying to build enthusiasm around his struggling campaign in Ohio by sharpening the contrast with President Obama, framing the election here Wednesday as a “very dramatic choice” between two competing visions for the country’s future.

With fresh polls showing him trailing Obama here, as well as in some other key battleground states, Romney sought to leverage the star power of professional golfer Jack Nicklaus, an Ohio native, to boost his candidacy.

The Republican nominee began the second day of his Ohio bus tour by arguing that his policies would do more to help the middle class and the millions of Americans who are struggling to make ends meet.

Nicklaus touched on similar themes during his lengthy introduction of Romney.

“We can’t keep doing what we’ve been doing,” Nicklaus said. “We have to look at problems at hand and change them.”