Not to step into your discussion with the other guy but examples are so numerous that I know of three more off the top of my head. The Most Expensive Mile of Subway Track on Earth , Mohammed Nuru's Penthouse, Leland Yee and Shrimp Boy.
First occurrence of the string "corrupt" in that article:
“Is it rigged? Yes,” said Charles G. Moerdler, who has served on the M.T.A. board since 2010. “I don’t think it’s corrupt..."
> Mohammed Nuru's Penthouse, Leland Yee and Shrimp Boy
OK, I'll concede those two. But both of those examples are from one city (San Francisco), so now at best we're up to two cities. That's not a "large number" in my book. Also, the Nuru example seems pretty petty (yeah, he built himself a nicer office than he should have. That hardly seems comparable to me to the President of the United States proposing to hold the G7 summit at a property that he personally owns.) And both Nuru and Yee were ultimately disgraced. Yee is still in prison.
At the level of Nuru and Yee, there are literally tens of thousands of Democratic officials of similar rank througout the country. Two examples of corruption, one of them petty, and both of them ultimately disgraced, hardly seems like a pattern to me.
By way of very stark contrast, the entire Republican party is covering up for Donald Trump.
And none of this speaks to the other problem I cited: denial of facts.