As a presidential candidate, U.S. Rep. Michele Bachmann showed no fear of taking on President Obama or the GOP establishment, faulting her own party for going along on the August debt deal and the Wall Street bank bailouts.

But rarely has the Minnesota Republican been a better barometer of the strains within her party than when it comes to presumptive GOP presidential nominee Mitt Romney, whose candidacy has yet to fire up the rank and file, particularly among Tea Partiers and Ron Paul Libertarians.

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