THURSDAY’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.

* A new Rasmussen poll offers more bad news for Sen. Blanche Lincoln (D) in Arkansas — she now trails all four of her Republican challengers in hypothetical matchups. Worse, much of the opposition is driven by Arkansans’ opposition to health care reform.

* A new survey from Public Policy Polling shows Rep. Mike Castle (R) leading Delaware’s closely-watched Senate race. In a hypothetical race against state Attorney General Beau Biden (D), the long-time congressman is up by six, 45% to 39%.

* President Obama’s new policy in Afghanistan has become an issue in Pennsylvania’s Democratic Senate primary — Rep. Joe Sestak supports the administration’s decision, and Sen. Arlen Specter is going after him over it.

* The key to success in Massachusetts’ Democratic Senate primary? If the candidates’ new ads are any indication, it’s claiming Ted Kennedy’s mantle.

* In Connecticut, the Republicans’ gubernatorial primary is getting pretty crowded. Lt. Gov. Michael Fedele joined the field yesterday, and former ambassador Tom Foley will join the race today, ending his faltering Senate bid.

* Far-right activist Eric Forcade will take on Rep. C.W. Bill Young in a Republican primary in Florida next year. Forcade says he is motivated by the positions “that have been popularized by Glenn Beck.”

* Sen. Bob Bennett (R) of Utah continues to look vulnerable to a possible primary challenge — a new Deseret News poll finds only 27% of Utahns want him to have another term.

* Rep. Donna Edwards (D-Md.), who was elected to Congress after launching a primary campaign against a centrist Democrat, may now face a primary challenge of her own.

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.