MONDAY’S CAMPAIGN ROUND-UP…. Today’s installment of campaign-related news items that wouldn’t generate a post of their own, but may be of interest to political observers.

* In case recent developments involving Colorado Republicans weren’t quite nutty enough, U.S. Senate hopeful Ken Buck — the Tea Party favorite — has been caught lashing out at his Birther supporters. Buck was filmed telling a voter, “Will you tell those dumbasses at the Tea Party to stop asking questions about birth certificates while I’m on the camera?” He walked back the language yesterday.

* If you’re inclined to believe Rasmussen, Gov. Joe Manchin (D) has the early lead in West Virginia’s Senate special election, leading John Raese (R) by 16, 51% to 35%.

* In related news, the race in West Virginia keeps getting more crowded. Including Manchin, the frontrunner in November, there are now 15 candidates, including 11 Republicans. The parties’ primaries are scheduled for Aug. 28.

* Missouri is home to one of the more competitive Senate contests this year, a contest Democrats consider a pick-up opportunity. At this point, however, the GOP has the edge — a Mason-Dixon poll shows Rep. Roy Blunt (R) leading Missouri Secretary of State Robin Carnahan (D), 48% to 42%.

* In case there were any doubts about how nervous Sen. John McCain (R) has been about his GOP primary against J.D. Hayworth, consider his FEC filings — McCain spent more than $10.2 million in the second quarter alone.

* Senate Majority Leader Harry Reid (D) told the Christian Broadcasting Network that GOP extremist Sharron Angle is “not mainstream for Nevada or probably most any other place in America.”

* And in 2012 news, New Jersey Gov. Chris Christie (R) has ruled out a presidential campaign, and Minnesota Gov. Tim Pawlenty (R) will likely launch his national campaign next year, regardless of what other potential candidates decide.

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Follow Steve on Twitter @stevebenen. Steve Benen is a producer at MSNBC's The Rachel Maddow Show. He was the principal contributor to the Washington Monthly's Political Animal blog from August 2008 until January 2012.