"Instead of spending his energy and attention raising money at $250,000 per check from out-of-state, right-wing ideologues, Scott Walker should have paid more attention to his failed promise to create 250,000 jobs here in Wisconsin," Barrett spokesperson Phillip Walzak said.

Democrats are pounding Walker over a recent report that said Wisconsin had lost more jobs than any state in the nation over the past year.

Among Walker's supporters are Charles and David Koch, billionaire brothers who have used their wealth from trading and commodities company Koch Industries to support conservative causes.

Polls show the recall election could be close, with Wisconsin voters evenly split and only a small number of undecided voters. If Walker loses, he would be only the third U.S. governor removed from office during his term.

On Tuesday, New Jersey Governor Chris Christie, who also has confronted unions, is expected to arrive in Wisconsin for two fundraisers for Walker.

An independent campaign finance expert in Wisconsin has said that spending by both sides in the recall election could reach a record $60 million.

(Writing by Greg McCune; Editing by Dan Burns and Will Dunham)