Mitt Romney, after weathering an onslaught of rotating primary challengers over the course of the last year, is poised to clinch the Republican presidential nomination as early as Tuesday.

In doing so, his campaign will complete its shift, from knocking off Republican rivals one by one to challenging a single Democratic opponent, President Obama.

And with the Obama campaign now pouring airtime and resources into the latest attacks on Romney’s private equity experience, the GOP candidate is discovering early that one of his biggest advantages in the primaries — his war chest — isn’t quite so impressive in the general.

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