Wow, the news on the 2008 Congressional races is coming fast and furious today. The latest: Muck-encrusted GOP Rep. Rick Renzi has got himself a new Dem challenger on his hands.

The Arizona Republic reports today that Dem State Rep. Ann Kirkpatrick resigned yesterday to take on Renzi. She faces at least two other Dems intent on running -- a surprising degree of interest in the seat this early in the cycle, probably the result of Renzi's muck-king status.

It's unknown whether Renzi will run again; a few months ago he was rumored to be resigning, though he strongly denied it. Check out our full coverage of Renzi over at TPMmuckraker.