The weekly on-balance volume (OBV) tested support, line d, on the correction and closed back above its WMA last week.

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The daily on-balance volume (OBV) does show a negative divergence, line b, which is consistent with a correction.

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Washington (CNN) -- Mitt Romney's course correction on whether the health care mandate is a tax puts him in line with Republicans who have pinned hopes for winning down-ballot races in part on hammering President Barack Obama for imposing what they've called the biggest tax in the nation's history.

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