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

* Wisconsin Democrats are filing the signatures necessary to trigger a third recall election against a Republican state senator. This time, it’s Luther Olsen and Dems have collected 162% of the necessary number of signatures. Olsen joins Dan Kapanke and Randy Hopper on the list of incumbents who’ll likely face recall races later this year.

* Just a few days after appearing at a far-right rally in Wisconsin, former half-term Gov. Sarah Palin (R) has relaunched her political action committee’s website, now featuring far more content and online features. The moves have increased speculation that Palin may yet launch a presidential campaign.

* Disgraced former Alabama Judge Roy Moore has apparently created a presidential exploratory committee. The former state Supreme Court justice, thrown off the bench for ignoring federal law, is in the midst of a six-day, 25-stop tour of Iowa. (thanks to reader M.M.)

* This should make for an awfully interesting congressional campaign: “Christie Vilsack, the wife of Agriculture Secretary and former Iowa Gov. Tom Vilsack, is likely to challenge GOP Rep. Steve King, according to several sources familiar with her thinking.”

* Former Florida Gov. Charlie Crist continues to move further away from his party, this week donating $1,000 to Patrick Murphy, a Democrat hoping to take on Rep. Allen West (R-Fla.) in 2012.

* As expected, Oregon Labor Commissioner Brad Avakian announced yesterday he will take on Rep. David Wu in a Democratic primary. Wu has struggled of late with mental health issues.

* And though it seems awfully early, Sen. Rand Paul (R) filed for re-election yesterday in Kentucky. Paul has only been in office for three months, and won’t face voters again until 2016.

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.