The facts that are denied will be those that run counter to the prevailing sacred cows of whatever movement it is. One that especially irks me on the Democratic side of the fence is denying that the minimum wage has a cost in jobs, despite near universal belief from economists that this is the case.
"Chicago continues to be the most corrupt city in the country and Illinois remains the third most corrupt state."
https://pols.uic.edu/chicago-politics/anti-corruption-report...
But that is one example. You said many large cities have been run exclusively by Democrats for decades and are notoriously corrupt. One is not many. AFAICT Chicago and Illinois are the exception rather than the rule among Democratically controlled cities and states.
Also, Democrats don't exhibit pride in their corruption the way Trump does. When Democratic corruption is exposed, Democrats seem to be, for the most part, ashamed of it. It's not just Trump's corruption that is problematic, it's the way he wears is proudly as if it were a badge of honor. When Rod Blagojevich tried to sell Obama's Senate seat, he was put in prison. And then he was pardoned by (of course) Donald Trump!
Also, your (one) example deals only with corruption. I cited two problems, the second being denial of facts. Do you dispute that?
First hit on Google is:
https://www.nytimes.com/2017/12/28/nyregion/new-york-subway-...
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.
https://rantt.com/gop-admins-had-38-times-more-criminal-conv...
But I suspect you will be unable to find someone who has done it because it's simply not true.
A lot of people care. Many of those who care believe that the situation we're in right now is caused (or at least greatly exacerbated) by incompetent leadership at the national level, but unfortunately that view is not shared by a substantial fraction of the American people, and against that kind of headwind there is only so much we can do.