Tuesday's campaign round-up

* Rep. George Miller (D-Calif.), a progressive champion and former chairman of three House committees, announced yesterday he'll retire at the end of the year. His district is widely expected to remain in Democratic hands.
* In an interesting move, New Jersey Gov. Chris Christie (R) will headline a fundraiser this week for right-wing congressional candidate Steve Lonegan. Lonegan, of course, recently ran a failed U.S. Senate campaign in the Garden State, and previous failed in a gubernatorial primary against Christie.
* In Arkansas, Lt. Gov. Mark Darr (R) has announced he'll step down from his post at the end of the month. Darr has been under pressure to resign following ethics allegations involving the misuse of public funds.
* In Georgia, the latest Atlanta Journal-Constitution poll shows incumbent Gov. Nathan Deal (R) leading Jason Carter (D) by nine, 47% to 38%.
* Senate Minority Whip John Cornyn (R) launched a new ad this week, making it seem as if he's running against President Obama. Cornyn's advertising has not yet mentioned his primary opponent, Rep. Steve Stockman.
* In a bit of a surprise in Montana, former Rep. Denny Rehberg (R) announced yesterday he will not run for any public office in 2014. There were rumors he'd run for his old House seat, which he gave up in 2012 for an unsuccessful Senate campaign.
* And in Tennessee, for the second consecutive cycle, former Rep. Zach Wamp's (R) son will take on Rep. Chuck Fleischmann (R) in a primary.