Just over two weeks ago, Sen. Mark Kirk (R-Ill.) made news when he became the first of his Republican legislative colleagues to rescind a previously extended endorsement of presumptive presidential nominee Donald Trump. Now, as Politico's Kevin Robillard reports, he's set to become another famous first in the Trump era:
The Chicago Tribune confirms that this 30-second spot will be part of a large ad buy -- to the tune of "about $230,000 in broadcast time for the weeklong buy and another $35,520 in cable TV time in Chicago."
The ad, titled "Even More," aims to present Kirk as an independent-minded, bipartisan legislator. Among other things, it points to his pro-choice bona fides and his support for a Senate hearing on President Barack Obama's Supreme Court nominee Merrick Garland.
But most notably, it takes great care to mention his opposition to Trump. Over a parade of floating headlines, the ad's narrator intones, "And Mark Kirk bucked his party to say that Donald Trump is not fit to be commander-in-chief."
There's another politician who is conspicuously not named in the ad -- Kirk's opponent in his re-election bid, Rep. Tammy Duckworth (D-Ill.). In 2010, Kirk squeaked out a win over then-Illinois State Treasurer Alexi Giannoulias to reach the Senate. Duckworth is a bona fide political superstar -- albeit one who is currently dogged by a civil lawsuit alleging various ethics violations.
There aren't likely to be many Republican incumbents -- especially vulnerable incumbents -- who openly disparage their party's nominee in this fashion. However, the particulars of Kirk's race -- deep blue state, popular Democratic opponent, incumbent who won by a thin margin in a wave election -- probably make slagging Trump in public an essential part of the calculus.

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Jason Linkins edits “Eat The Press” for The Huffington Post and co-hosts the HuffPost Politics podcast “So, That Happened.” Subscribe here, and listen to the latest episode below.