TUESDAY’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.

* The GOP strategist behind the Willie Horton ads in 1988 is now going after Senate Majority Leader Harry Reid (D-Nev.). The new spot accuses Reid of being supported by Arab slave-masters.

* Sen. Arlen Specter’s (D-Pa.) primary campaign got a boost yesterday with an endorsement from the Pennsylvania chapter of the Service Employees International Union.

* Speaking of labor endorsements, Sen. Michael Bennet’s (D-Colo.) primary campaign also got a boost yesterday with an endorsement from the Colorado chapter of AFSCME.

* On a related note, today is a key day for Bennet’s campaign, with Colorado hosting its first round of precinct caucuses across the state.

* And in still more Colorado news, the latest survey from Public Policy Polling shows Bennet leading his Democratic primary challenger, Andrew Romanoff, by six, 40% to 34%.

* As the far-right wing of the GOP rallies against Sen. John McCain (R-Ariz.), former half-term Alaska Gov. Sarah Palin (R), probably feeling a sense of obligation, has agreed to campaign alongside her former running mate later this month.

* In California, Senate hopeful Carly Fiorina supported cap-and-trade, right up until she started running for office as a Republican.

* And in North Carolina, the latest survey from Public Policy Polling shows no clear favorite in the crowded Democratic Senate primary. NC Secretary of State Elaine Marshall (D) is out in front, but her support is only at 20%. Former state Senator Cal Cunningham (D) is second with 16%.

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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.