This can’t happen in a healthy democracy, or a healthy culture for that matter.
Rep. Sheila Cherfilus-McCormick is so clearly corrupt and a crook that even her corrupt party wouldn’t defend her. That’s quite an achievement. Democrats wouldn’t even go through their usual spin and denial routine, like the Axis did to pretend Joe Biden, the brain-damaged President Democrats inflicted on the nation, wasn’t an empty shell unfit to be in the White House. This is the party that insists to this day (at least publicly) that Kamala Harris ran a flawless campaign and was only defeated because too many Americans won’t vote for a sort-of black woman to be President. Cherfilus-McCormick resigned from Congress because she knew that the House ethics investigation was about to expose her and that she faced a bi-partisan expulsion.
The panel had previously found her guilty of 25 ethics violations, among them stealing $5 million dollars in federal disaster-aid funds to support her 2021 campaign. The two-year investigation included interviews of 28 witnesses and examination of more than 33,000 documents. Never mind, though: Cherfilus-McCormick filed on April 17 to run again for her seat in South Florida, where apparently dupes, fools and ignoramuses run like salmon at mating time. A political operative told reporters, “While we would have to check with the lawyers to see if Cherfilus-McCormick can run using Cell Block C as her residence, it isn’t clear that there is anyone in that district who can beat her if she runs again.” The district, he explained, is “heavily reliant on name recognition,” and the expensive media markets from West Palm Beach to Fort Lauderdale will make it difficult for another Democrat to attract enough support to win.
Oh, that’s wonderful, isn’t it? In other words, enough voters in her district either won’t pay enough attention to realize their Congresswoman is a thief, or they don’t care that the woman is devoid of most ethical instincts necessary to justify the public’s trust.
Ethics Alarms 
From the 20th district’s Wikipedia page:
“The district includes most of the majority-Black precincts in and around western and central Broward County and small portion of southeastern Palm Beach County. The district is the only majority-Black district in Florida.”
I would like to question the “canary in the coalmine” designation, as corruption has been part of the political landscape since a very long time, at least since Tammany Hall, Boss Tweed, and Roscoe Conkling; that episode in American History has plenty of material for a very long ethics post at Ethics Alarms?
What about Governor Huey Long from Louisiana? Major Big Bill Johnson from Chicago? Or the many governors from Illinois who later went to prison?
So my impression is that Cherfilus-McCormick is most likely a crook; however she is not a bigger than life crook about whom films have been made, such as Huey Long.
About Mark Warner running for Congress again, that is not a canary in the coal mine either; that has been an ex-canary for a long time who kicked the bucket during the Clinton impeachment trial, when the Senate decided to give Bill Clinton a pass for his sexual harassment and perjury. That event instilled in Republicans the attitude that they were not willing to contend anymore with the double standards of the Democrats anymore, and hence adultery has not been a political career killer for Republicans anymore since Bill Clinton.
The common ground for both political bases is that they would rather vote for a crook or a public sinner from their own party, than for anybody representing the other party. That also illustrates the political polarization in this country, as both parties have little common ground anymore.