Looking at LBJ’s maneuvers, one could argue that the installment of political prohibitions on non-profits was itself a political move, since Johnson used it to quell a rising tide of wealthy conservatives looking to take him out of office. Without that political maneuver, though, Johnson perhaps doesn’t get re-elected to the Senate, and then maybe doesn’t later get elected President of the U.S. In that case, he never pushes for and signs into law the Voting Rights Act and a stronger Civil Rights Act.
Tea party groups today claim non-partisanship, despite clear evidence otherwise, but it looks like the history of tax exempt status for non-profits wasn’t politically neutral to begin with.
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