FRIDAY’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.

* With Massachusetts’ increasingly strange Sen. Scott Brown (R) refusing to retract or apologize for his bizarre remarks about Rachel Maddow possibly running against him, the MSNBC host took out a full-page ad in the Boston Globe today.

* In Arkansas, a new Research 2000 poll shows incumbent Sen. Blanche Lincoln leading Lt. Gov. Bill Halter in a Democratic primary, 44% to 31%. But in general election match-ups, Lincoln currently trails all five GOP candidates, and Halter looks stronger.

* In related news, Lincoln continues to distance herself from labor unions, but “documents show Lincoln aggressively sought the support of these ‘Washington D.C. unions’ several months ago –undercutting her derision for them.”

* In the state of Washington, a Research 2000 poll shows incumbent Sen. Patty Murray (D) with surprisingly strong, double-digit leads over her three most credible Republican challengers, Dino Rossi, Dave Reichert, and Don Benton.

* In an interesting twist in Kentucky’s Democratic Senate primary, state AG Jack Conway is hitting Lt. Gov. Daniel Mongiardo for opposing health care reform.

* With Rep. Dennis Moore (D-Kan.) retiring this year, Kansas Democrats have been searching for a top-tier candidate. They found one: Dennis Moore’s wife, Stephene.

* In South Florida, congressional candidate Corey Poitier, an African-American Republican running in a heavily Democratic district, referred to President Obama this week as “Buckwheat.”

* And believe it or not, Rick Santorum continues to pursue a presidential campaign.

Steve Benen

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.