The Republican group Senate Leadership Fund is wasting no time attacking vulnerable 2018 Democrats for their votes against Neil Gorsuch's Supreme Court nomination. Its first ad goes live tomorrow hitting Missouri Sen. Claire McCaskill for her no vote and points out she voted yes on all of Obama's judges.

What's coming next: Titled "Down the Line Liberal," the ad foreshadows a theme that Republicans will use to attack other red state Democrats whose political brands depend on their reputations as centrists.

Specifics: The ad is digital only and will begin by targeting Trump supporters in Missouri, says Senate Leadership Fund strategist Carl Forti. He tells me the spend is mid-five figures through early next week, then the group will decide how much more they want to put behind it, potentially with some TV.

(This story has been updated to correct the name of the group in the first and third paragraphs. It's the Senate Leadership Fund not American Crossroads.)