PORTLAND — A day after Mitt Romney regained some momentum in the Republican presidential contest, his rival Rick Santorum went on the attack, calling the front-runner “desperate” while promising to compete aggressively to win the state where Romney grew up.

Santorum said Sunday that he could do “exceptionally well” in Michigan, where Romney’s father served as governor. The Midwestern state and Arizona host Republican presidential nominating contests Feb. 28.

“We’re going to spend a lot of time in Michigan and Arizona, and those are up next. And that’s where we’ve really been focusing on,” Santorum told ABC’s “This Week.”

He suggested that a strong showing in those contests would make the presidential contest “a two-man race,” dismissing current rivals Newt Gingrich and Ron Paul.

CANDIDATES TRADE JABS

Santorum shrugged off his third-place finish Saturday in caucuses in Maine, where he didn’t actively compete, as well as his second-place finish in a straw poll of conservative activists.

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Romney has been painting Santorum as a longtime Washington insider who pursued home-state projects. Santorum on Sunday described Romney’s recent criticism as “desperate.”

“You reach a point where desperate people do desperate things,” said Santorum, who represented Pennsylvania during his 16 years in Congress, first in the House and then in the Senate.

Maine GOP officials declared Romney the winner of Saturday’s caucuses. The results ended a three-state losing streak to Santorum, who swept contests in Colorado, Minnesota and Missouri last Tuesday.

Romney and his rivals now have 17 days to raise cash and bolster their organizations for what’s shaping up to be a slog to the Republican nomination and the right to face President Obama in November.

As Santorum eyes Michigan, Romney turns his attention to extending his huge cash advantage over his rivals.

Romney left Maine before the caucus results were announced to attend a West Coast fundraiser Saturday night. He issued a statement to mark his victory in the low-turnout contest.

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“I’m heartened to have the support of so many good people in this great state,” he said in the written statement. “The voters of Maine have sent a clear message that it is past time to send an outsider to the White House.”

Romney is expected to spend much of this week courting donors, while sprinkling in a handful of campaign events. He’ll be in Arizona this  evening.

Romney won a plurality of the Maine vote just hours after winning the presidential straw poll at the Conservative Political Action Committee conference in Washington.

SKEPTICISM ABOUT ROMNEY LINGERS

But questions about Romney’s durability as his party’s presumed front-runner persist. Fully 61 percent of Maine voters selected a candidate other than Massachusetts’ former governor in a state practically in his backyard. And Romney’s showing was down considerably from 2008, when he won 51 percent of the vote.

Former Alaska Gov. Sarah Palin said Romney has work to do to convince Republican voters that he’s moved beyond his “pretty moderate past … even in some cases a liberal past.”

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“I am not convinced, and I do not think the majority of GOP and independent voters are convinced,” Palin said on Fox News Sunday.

Romney has focused more on social issues in recent days. He has been particularly aggressive in criticizing Obama’s recent decision regarding contraception.

On Friday, after three weeks of controversy that pitted the nation’s Catholic bishops against the White House, Obama revised his policy. Instead of requiring church-affiliated nonprofits to cover free contraception with the health insurance they offer workers, the policy now requires insurance companies to provide free birth control coverage in separate agreements with workers who want it.

White House chief of staff Jack Lew defended the decision Sunday, noting that there is no longer room for compromise.

“This is our plan,” he said on CNN’s “State of the Union.”

FOCUS ON SOCIAL ISSUES

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Santorum, a Catholic, said the president’s plan doesn’t resolve the issue. He says many Catholic institutions are self-insured and those organizations will still be forced to pay for women’s contraception despite their religious objections.

“They are forcing religious organizations, either directly or indirectly to pay for something that they find is a deeply, morally, you know, wrong thing,” Santorum told NBC’s “Meet the Press.”

The focus on social issues plays well for Santorum, who has long been considered a staunch cultural conservative.

Coming off last week’s success, Santorum saw a surge in donations. His campaign reports gathering $3 million in the three days immediately following after last week’s hat trick, but he’s unlikely to catch Romney in the money race.

Santorum reported just $279,000 in the bank at the end of December, compared with Romney’s $19.9 million. Ging-rich had $2.1 million, but is still carrying substantial debt, while Paul reported $1.9 million.

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