‘ON THEIR SIDE’…. In recent months, we’ve seen Democrats push some campaign themes to describe Republicans, usually relying on “Party of No.” Thanks in part to Rep. Joe Barton’s (R-Texas) apology to BP, a new theme seems to be emerging.

The Democratic National Committee released this new clip today — it’s not a television ad, just a web video — connecting Barton to a larger trend of GOP leaders siding with powerful interests over the needs of the public. The name of the ad is, “On Their Side.”

If you can’t watch clips from your work computer, the video starts with on-screen text that reads, “On The Side of Big Oil,” followed by Barton’s apology to BP’s Tony Hayward. We then see, “On The Side of Insurance Companies,” followed by a clip of Mitt Romney arguing that health insurance companies have nothing to do with health care being too expensive. The third hit says, “On The Side of Wall Street,” followed by Michael Steele urging Americans to trust Wall Street to help the economy.

The wrap-up: “Republicans: This Is How They Would Govern.”

It’s not subtle, but it’s effective. If the midterm elections are going to be nationalized, it’s only reasonable to highlight who’ll benefit from a GOP majority.

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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.