Michigan Republicans, in response to a suit brought by the Obama campaign and the Democratic Party, admit they had been planning to use an illegal method challenging voters based on foreclosure lists. The suit's settlement stipulates they will not attempt such a scheme.
Here's another reason for the GOP to dump on ACORN: direct investigation away from their voter-suppression efforts. The McCain Campaign has paid Lincoln Strategy and its managing partner Nathan Sproul $175,000 for voter registration. But Sproul would only register Republicans. Forms that indicate a Democrat get thrown away. Sproul has a long history of such "ethically-blurry, brass-knuckle tactics".