* Rep. John Dingell (D-Mich.), who's served longer in the House than anyone ever, will announce his retirement today. Dingell, who will turn 88 in July, was first elected to the seat in 1955.
* In Kansas, Senate hopeful Milton Wolf, taking on Sen. Pat Roberts in a Republican primary, was found to have posted "a collection of gruesome X-ray images of gunshot fatalities and medical injuries to his Facebook page and participated in online commentary layered with macabre jokes and descriptions of carnage." Wolf apologized yesterday.
* The Kansas revelations coincide with a new PPP poll that found Roberts' approval rating slipping in the wake of reports that the senator no longer maintains a home in the state he represents.
* And in still more Kansas news, it may seem hard to believe, but PPP shows Gov. Sam Brownback (R) trailing his Democratic challenger, Paul Davis, by two points in this year's gubernatorial race.
* In Kentucky, Senate Minority Leader Mitch McConnell's (R) primary challenger, Matt Bevin, is launching a new attack ad accusing the senator of "betraying conservatives" by opposing a filibuster on the debt-ceiling increase. Bevin, who may not fully understand what the debt ceiling is, says in the ad that he "opposes raising the national debt, period."
* Former Sen. Scott Brown (R) has not yet formally announced whether he'll switch states and run again, but the latest PPP poll shows him trailing Sen. Jeanne Shaheen (D) in New Hampshire by eight points. A month ago, the same pollster showed Shaheen up by three.
* The Koch-financed Americans for Prosperity is continuing its aggressive ad campaign, announcing a major new ad buy in Alaska attacking Sen. Mark Begich (D) over health care.
* In Texas, a new University of Texas/Texas Tribune Poll shows state Attorney General Greg Abbott (R) with a double-digit lead in this year's gubernatorial race, leading state Sen. Wendy Davis (D) by 11 points, 47% to 36%.