Sorry, Pat Roberts. You praised Claire McCaskill. You can’t take it back

Sen. Pat Roberts wants a do-over. The Kansas Republican is irked about a commercial from his Democratic colleague, Sen. Claire McCaskill.

In the ad, McCaskill’s campaign quotes Roberts: “If you want to pick somebody to work in a bipartisan manner and get something done … you ask Claire McCaskill because she does get the job done.”

Roberts’ statement is now inoperative, apparently. “I’m very disappointed that she’s sided with her party’s leadership and opposed the Trump administration,” he said Tuesday. He wants to be removed from the ad.

But — it should be noted — Roberts called McCaskill bipartisan in August 2017, several months after Trump took office. If the senator had problems with the Missouri Democrat’s record, he should have said something then. He did not. And he doesn’t get to issue a retraction now that campaign season is in full swing.

Roberts’ effort to rewrite history is doubly disappointing because he was once considered something of a bipartisan lawmaker himself. Not anymore. He votes with Trump 96 percent of the time.

There will be a chance, potentially, for McCaskill to return Roberts’ favor. If he runs in 2020, he can claim her support if he wants.

For now, though, we know where Pat Roberts stands. Sort of.