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:

* In a new Politico/GW poll, President Obama leads his top Republican challengers in hypothetical match-ups, despite a low approval rating. Obama tops Mitt Romney by six points, and Cain by nine points.

* In something akin to a Hail Mary pass, Rick Perry’s presidential campaign is making a massive ad buy on Fox News, spending nearly $1 million on commercials.

* Herman Cain’s wife, Gloria Cain, will sit down for her first nationally-televised interview tonight, appearing with Fox News’ Greta Van Susteren.

* In Ohio, the latest survey from Public Policy Polling shows Sen. Sherrod Brown (D) up by 15 points over his Republican challenger, Josh Mandel. A month ago, the incumbent Democrat led by eight points.

* In Minnesota, a poll from a Minneapolis television station shows Sen. Amy Klobuchar (D) with big leads over her possible GOP opponents next year, including double-digit leads over Tim Pawlenty and Norm Coleman, neither of whom appear likely to run anyway.

* A judge in Colorado has approved a Democratic-friendly congressional-district map, which makes Rep. Mike Coffman’s (R) seat far more competitive.

* Tennessee is not among the early Republican primary states, but a new Vanderbilt poll nevertheless shows Herman Cain as the top Republican candidate in the state, leading the field with 22% support.

* And in Virginia, where Republicans fared quite well last week, but a county prosecutor race in House Majority Leader Eric Cantor’s (R) district has in-state Dems feeling some optimism.

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.