NEW CIVILITY WATCH: Ex-Obama aide unleashes R-rated rant against Kyrsten Sinema for breaking ranks on filibuster.

U.S. Sen. Kyrsten Sinema of Arizona is no stranger to taking flak from fellow Democrats for bucking the party line — but a former high-level aide to President Barack Obama may have crossed another line.

“I think she’s a c—,” Alyssa Mastromonaco told the “Pod Save America” podcast earlier this month, after Sinema refused to side with other Democrats regarding the filibuster. “That’s what I have to say.”

Mastromonaco chose a fairly large platform for her profanity-laced remarks: According to Chartable, the podcast has enormous reach, and is the seventh-highest news program on Apple Podcasts.

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“She talks about the ‘disease of division,’” Mastromonaco said about the senator. “She gave the speech as Joe Biden was on [his] way up to the Hill. So anyway, it’s the s—tiest, grossest, most disrespectful thing she could’ve done. I think she’s a c—. That’s what I have to say.”

The hosts, also ex-Obama staffers, laughed in response, before one asked, “Do we have to beep that?”

“No, because I’m a woman,” Mastromonaco replied. “I’m a woman, OK?”

Then she continued, “It was so many layers of a—holeness, like you know that she played a combative video game before she went down to the Senate floor, and was like, ‘You are a maverick. You are a maverick!’ And b—-, you’re not a maverick. OK? No. You’re trash.”

The conversation then moved to the late Sen. John McCain, also of Arizona, who pundits often referred to as a maverick in the Senate.

“The best part about this take is that there’s no one out there making the case for bipartisanship,” added co-host Daniel Pfeiffer, responding to the original Washington Post piece.

Thus, the perfect definition of bipartisanship: It’s brilliant and thoughtful when a nominally Republican senator forces leftist policies on America; it’s a sign that Washington has failed when a nominal Democrat attempts to keep the left from going over a cliff.