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He added that the “most important message from Wisconsin is, if that state is close, then other swing states like Florida and North Carolina are likely leaning more Romney than most polls suggest.”

While Republicans in Wisconsin were urging Mr. Romney to spend money in the state this fall, outside analysts were more skeptical.

“I don’t see Wisconsin in play,” said John Zogby, who conducts polling for The Washington Times. “On Tuesday, voters there chose Obama over Romney and they also chose stalemate.

“Neither side won — both parties climbed a mound of cow dung and are trying to plant a flag. It was ugly,” Mr. Zogby said. “Best for Romney to run more quietly.”

Where Mr. Romney, the super PACs supporting him and the Republican National Committee choose to concentrate their financial firepower this fall seems less important to Democrats than how big that firepower will be.

Democratic Congressional Campaign Committee Chairman Steve Israel made an emergency plea Wednesday for fellow Democrats to go after big donors the way he said Republicans have with great success.

“The Wisconsin results should serve as a wake-up call for Democrats: on the ground organizing is critically important, but it must be coupled with an aggressive air campaign,” Mr. Israel said in an email to supporters, referring to the huge amounts it takes to run an effective TV ad campaign in many key media markets across the country.

Republicans only a few years ago were complaining that deep-pocket Democratic donors outnumbered and outgave their Republican counterparts. Now it’s the Democrats who are complaining about the playing field.

“Democratic groups won’t outspend Republican groups, but they can keep us in the fight,” Mr. Israel said.