Who is poised to win Tuesday’s Republican presidential primary in Michigan? After nearly two weeks of heavy campaigning, it appears to be too close to tell.

Two polls released Sunday showed a tight race between Mitt Romney, the former Massachusetts governor, and Rick Santorum, the former U.S. senator from Pennsylvania. One, from Public Policy Polling, had Romney up 39% to 37% (with 13% for Ron Paul and 9% for Newt Gingrich), continuing a recent trend in polls showing Romney ahead.

But the other, from Mitchell Research/Rosetta Stone and performed for the Michigan Information & Research Service (MIRS), showed Santoum back on top, 37% to 35% for Romney. (It also reversed the order of those trailing, with Gingrich having 9% and Paul having 8%)

A third poll, from Foster McCollum White & Associates showed Romney with a much larger lead – 39% to 31% (with Gingrich and Paul each with 9%).

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