Sen. Russ Feingold (D-Wis.) said he has absolutely no reservations about appearing in Wisconsin on Monday with President Obama.

Feingold, a liberal Democrat who's facing a tough reelection battle this fall, said he was proud to appear with Obama as the president arrived in Wisconsin Monday morning for a speech on the economy and a fundraiser.

"Absolutely none," Feingold said when asked if he has any qualms about appearing with Obama, according to a pool report.

"I'm pleased to stand with this president any time and anywhere and defend what we've done and what we're doing," the senator added.

While Feingold may be betting on benefiting from Obama, other Democrats aren't as sure. Several vulnerable incumbents have avoided appearing with Obama, or have at least ducked questions as to whether or not they would like to campaign with the president.

Sen. Michael Bennet (D-Colo.), for instance, said last week that he would "have to see" whether he wanted Obama, who endorsed Bennet in a bruising primary, to campaign with him. Rep. Joe Donnelly (D-Ind.) also swiped at Obama and House Speaker Nancy Pelosi (D-Calif.) in a new TV ad.

The emerging debate over Obama's role on the campaign trail also spurred Democratic National Committee Chairman Tim Kaine to opine last week that candidates who chose to avoid their own party's president were making a "mistake."

"If you distance yourself from the president, you can pour cold water on the excitement about what he is doing," Kaine told The Hill. "I can tell you this. Everywhere I go, every last community I visit, there are energetic supporters of this president who are excited about what he is doing."