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Evan Vucci, Associated Press
Republican presidential candidate, former Pennsylvania Sen. Rick Santorum is surrounded by media as he orders food at Buffalo Wild Wings during a campaign stop on Friday, Dec. 30, 2011 in Ames, Iowa. Republican presidential candidates are largely shifting from persuading voters to mobilizing them for Tuesday's caucuses.

AMES, Iowa — Republican hopeful Rick Santorum is stepping up his grassroots efforts, turning his attention to delivering backers to next week's caucuses.

Santorum worked his way through a noisy sports bar in Ames on Friday to watch Iowa State play Rutgers in the New Era Pinstripe Bowl.

Followed by a mob of cameras, Santorum says his campaign is working hard on turnout efforts. He says the campaign has in place 1,000 precinct captains who will make the case for him Tuesday.

Santorum has sent out a fundraising appeal on the heels of his improvement in polls and says he just had his best fundraising day ever. He gives no details but says he'll go on the air in New Hampshire on Monday.