THURSDAY’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:

* With the DCCC launching ads in 19 House Republicans’ districts, Crossroads GPS, the Karl Rove-backed “independent” group, is investing $90,000 on radio ads in the same districts to defend the targeted lawmakers.

* Right-wing activists in Indiana weren’t bluffing — state Treasurer Richard Mourdock (R) has begun taking the initial steps to challenge incumbent Sen. Richard Lugar (R) in a Republican primary next year.

* Apparently part of her ridiculous national ambitions, Rep. Michele Bachmann (R-Minn.) will travel to South Carolina — home to one of the earliest 2012 primaries — this week.

* Sen. John Thune (R) of South Dakota has expressed an interest in running for president, but the latest evidence suggests he’ll pass on the 2012 race and remain in the Senate.

* In Massachusetts, Sen. Scott Brown (R) is likely to face a top-tier Democratic challenger next year, but it won’t be Rep. Barney Frank (D). The Democratic House member said today he’ll seek re-election, instead.

* In Florida, a new Quinnipiac poll shows Sen. Bill Nelson (D), up for re-election in 2012, with a 45% approval rating. That’s not horrible, but only 43% of Floridians believe he deserves another term.

* Speaking of Florida, Sunshine State Republicans are interested in blowing off their party’s 2012 presidential nominating calendar, and moving up their primary. RNC Chairman Reince Priebus is desperate to convince them otherwise.

* Republicans have plenty of Senate targets next year, but Sen. Dianne Feinstein (D) of California probably shouldn’t be one of them — the latest survey from Public Policy Polling shows her with big leads over all of her likely GOP challengers.

* And in Alaska, defeated Senate candidate Joe Miller (R) still has quite a bit of money in the bank and is thinking about a 2012 campaign against someone — though it’s unclear who. One possibility is a primary race against Rep. Don Young (R), rather than waiting until 2014 to take on Sen. Mark Begich (D).

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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.