Today's installment of campaign-related news items from across the country.
* If you missed last night's show, CNN has tweaked its debate format -- after swearing up and down that it would not -- making it more likely that Carly Fiorina will participate in the next prime-time event.
* The detail in the new Washington Post/ABC News poll that Republicans will like: Hillary Clinton's favorability numbers are underwater, with critics outnumbering supporters. The detail Democrats will like: Clinton is still better liked than the leading GOP presidential candidates.
* It's probably about time for Rick Perry to call it a day -- his New Hampshire political director, Dante Vitagliano, quit this week to join John Kasich's operation.
* Donald Trump released yet another video criticizing Jeb Bush yesterday, and this one highlights Bush family praise for Bill and Hillary Clinton.
* In Iowa, a new Loras College poll shows Trump leading the Republicans' 2016 field with 25% support, followed by Ben Carson at 18% and Jeb Bush at 10%. Scott Walker, the one-time frontrunner in Iowa is in fifth place in this poll with 6%.
* Repeating a tactic he used effectively four years ago, Rick Santorum has now visited all of Iowa's 99 counties.
* Responding to the latest round of attention about a possible Mitt Romney campaign, Romney adviser Eric Fehrnstrom reiterated yesterday that the 2012 nominee is "not reconsidering" his decision to skip the 2016 race.
* Chris Christie said this week that if he doesn't get more questions in the next Republican debate, he'll go "nuclear." I can't be the only one curious about what that might look like.