Today’s installment of campaign-related news items that won’t necessarily generate a post of their own, but may be of interest to political observers:

* Herman Cain’s campaign staffers, who travel with the candidate, have been told in a memo, “Do not speak to him unless you are spoken to.” What an odd candidate.

* The DNC slams Mitt Romney in a new video for his collective-bargaining flip-flop, making good use of his “I’m running for office for Pete’s sake” line.

* In Iowa, a new CNN/Time/ORC International poll shows Romney leading the presidential field with 24% support, followed by Cain. Ron Paul, Newt Gingrich, and Rick Perry barely reach double digits.

* In New Hampshire, the CNN/Time/ORC International poll found Romney way out in front with 40%, followed by Cain at 13% and Paul with 12%.

* In South Carolina, the CNN/Time/ORC International poll found Romney leading Cain, 25% to 23%. Paul and Perry barely reach double digits.

* In Florida, the CNN/Time/ORC International poll found Romney leading the field with 30%, followed by Cain at 18%.

* In Massachusetts, City Year co-founder Alan Khazei is scrapping his Democratic Senate campaign, clearing the way for Elizabeth Warren (D) to take on Sen. Scott Brown (R) next year.

* Speaking of the Bay State, Rep. John Olver (D-Mass.) announced that he is retiring at the end of the term. His district was likely to be eliminated through redistricting.

* Michele Bachmann’s campaign operation in New Hampshire has fallen apart so completely, the right-wing congresswoman had to file for the first presidential primary through the mail, rather than in person.

* In Florida, Rep. Connie Mack IV (R-Fla.) announced earlier this year that he wouldn’t run for the Senate, and yesterday, he changed his mind. Mack’s father, Connie Mack III, was a two-term senator from Florida.

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.