It has just seemed bizarre to me how the White House has blocked key witnesses from testifying, and then claims as a defense that the allowed witnesses only have second or third hand accounts. But regardless, the vote will not be evidence based.
The most recent polls I've seen say 50% support impeachment and removal from office and there has been a shift of independents moving towards impeachment. My take so far is that the proceedings won't have any significant effects on the 2020 election. The lines have been already drawn, but those numbers are probably enough to vaguely forecast a Trump defeat.