Former Pennsylvania U.S. Sen. Rick Santorum’s popularity surge has extended to Ohio, where he now is favored among likely Republican voters to win the state’s GOP primary, a new poll shows.

But the latest Quinnipiac poll, noting the ups and downs of Santorum, Mitt Romney, Newt Gingrich and others, comes with caution.

“Unclear is whether that momentum fizzles as happened to Santorum in New Hampshire after winning Iowa, and as happened to Gov. Mitt Romney in South Carolina after winning New Hampshire and Speaker Newt Gingrich in Florida after taking South Carolina,” said Peter A. Brown, assistant director of the Quinnipiac University Polling Institute.

Santorum, Brown says, appears to be riding the momentum gained from last week’s victories in Minnesota, Colorado and Missouri.

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