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Eric Gay, Associated Press
Republican presidential candidate, Rep. Michele Bachmann, R-Minn, third from left, back row, poses for photos during a campaign stop at the Dutch Bakery, Friday, Dec. 16, 2011, in Orange City, Iowa.

ORANGE CITY, Iowa — Michele Bachmann is rumbling through Iowa, hoping for a caucus comeback in time for the voting here next month.

The Minnesota congresswoman started a bus tour Friday that's to take her through the state's 99 counties, where she'll ask voters to give her lagging campaign another look. Bachmann says she's the only consistent conservative running. She says Newt Gingrich and Mitt Romney, both leading contenders for the GOP presidential nomination, aren't conservative enough.

Bachmann won an early test vote in August but since has slipped from the top tier.

She's now hoping that that more than a week of retail campaigning by bus will give her a much needed lift heading into South Carolina. She does not plan to campaign aggressively in New Hampshire, which votes after Iowa.