The battle over ACORN — the Obama-friendly grassroots group that's registered 1.3 million voters — hasn't let up since Wednesday night. That was when McCain said the group may be "destroying the fabric of democracy."

Today the Obama campaign called for an investigation by special prosecutor Nora Dannehy. She's already looking into the 2007 dismissals of eight U.S. attorneys, some of whom were ousted after they declined to prosecute voter fraud cases.

Obama lawyer Bob Bauer said the Justice Department, McCain campaign and Republican National Committee have formed "an unholy alliance of law enforcement and the ugliest form of partisan politics," to wage "a war on voters." He's asking for an investigation, and in the process links McCain with one of the Bush administration's bigger scandals.

More about this and other ACORN news is at the Secret Money Project blog. C'mon over.