IRS Probe Ignored Most Influential, Wealthiest Political GroupsThe nation's tax agency has admitted to inappropriately scrutinizing smaller tea party organizations that applied for tax-exempt status. But the IRS largely maintained a hands-off policy with the much larger, big-budget organizations on the left and right that were most influential in the 2012 elections and are organized under a section of the tax code that allows them to hide their donors.

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