"The final Senate vote on impeachment will be an acquittal and the resulting news coverage will depress the Democratic turnout."

The entire process will be long and futile. Not just ultimately futile, but futile throughout. Nothing will come of it except Democratic losses since nothing surprising about this creep can be said at this point. It will drag down American morale every step of the way, to no good end. It would likely result in a miserable stretch of months, filled with bad guys saying they're winning, good guys saying "We don't have anything yet..." and news reporters saying, "Everything's undecided. But yes, the Democrats are correct. They have nothing as of yet." 

The Democrats need something more than what they have. You could argue that is what the impeachment process will net them (and us) eventually, but absent any clear indication of a bunny at the bottom of the bowl, there is no reason to down this particularly bitter serving of mush.

You're banking on those redacted reveals in the Mueller Report being A.) Breathtaking and B.) Something that can actually be used in a public proceeding. That's a big risk, and again, the report could definitively prove Trump is a serial killing child rapist and Vladimir Putin's intel-leaking love slave and our Republican representatives in the Senate would still clear him, trumpeting his innocence to the heavens. Wal-Mart wouldn't be able to stock enough tiki torches for everyone in his Deep South victory parade.

And U.S. voters in general would only vote Trump out for such crimes if the news broke within 72 hours of their trip to the polls. Otherwise, their minds would be off that and onto whatever streaming show had the biggest, bloodthirstiest finale that week. "Yeah, I heard something about him doing clown paintings and burying the kids in the Rose Garden, but who can keep any of that political stuff straight these days? Did you see everyone in Asia get turned inside out on Game of Breaking Mirrors last night?" 

I want to believe better of the political process and the people of this country. I'd enjoy life more if I could. They've shown me however that they are not to be relied upon, either of them.

---

This. Trump is but a symptom of what ails society today, not the cause. Brexit happened independently of Trump, for example. If the Democrats want to win, they need to address this, instead. So far the 20+ Democrats seems to be running on an "I'm not Trump" platform. Unseating an incumbent President is NOT easy, and in the past that involve people voting FOR a new candidate instead of just voting AGAINST the previous one.

“I had nothing to do with Russia helping me to get elected.”

Mueller: "The central allegation of our indictments [are] that there were multiple, systematic efforts to interfere in our election." This 'concerted attack', as Mueller describes it, was launched by Russian intelligence officers who were part of the Russian military.

But it's a witchhunt, right?

Putting aside questions of whether Trump was involved or not, of how much he knew about what was going on, it's mind boggling that his attitude to an attack on US democracy has been that it shouldn't be investigated and as long as no-one is blaming him, everything is A-OK.

Just contemplate how hard you have to work in order to reconcile the two positions:

This was a witch hunt to uncover the multiple, systematic and concerted efforts to attack the US Presidential election process by Russian Intelligence officers who were part of the Russian military?

Look for the new legal defense of "ignorant guilt" in a courtroom year you.