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:

* In Pennsylvania, a new Quinnipiac poll shows Sen. Robert Casey (D) with a lukewarm approval rating of 39%. However, looking ahead of 2012, the same poll shows Casey leading a generic Republican challenger, 43% to 35%.

* On a related note, Rep. Tim Murphy (R-Pa.) has begun “informal” discussions about taking on Casey.

* Sen. Joe Lieberman (I-Conn.), looking ahead to 2012, will chat with Democratic Senatorial Campaign Committee Chair Patty Murray to discuss his re-election bid, but that doesn’t necessarily mean he has any interest in seeking the party’s nomination.

* More than a half-dozen House Democrats who lost last month are already planning rematches in 2012. Among those eyeing a comeback are Reps. Carol Shea-Porter of New Hampshire, Phil Hare of Illinois, Dina Titus of Nevada, Frank Kratovil Jr. of Maryland, Alan Mollohan of West Virginia and Glenn Nye of Virginia.

* In Ohio, Rep. Jim Jordan (R) is arguably one of the strongest possible challengers to Sen. Sherrod Brown (D) in 2012, but he doesn’t sound interested in the race.

* It seems very likely state officials in Indiana will eliminate Rep. Joe Donnelly’s (D) district after the lines are redrawn, and with that in mind, Donnelly appears quite likely to run for governor in 2012.

* In Ohio, the latest Public Policy Polling survey shows President Obama’s approval rating down to just 42%, but in hypothetical match-ups against likely Republican challengers, the president leads the GOP field. The margin ranges from one point (against Huckabee) to seven points (against Palin).

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.