Trump lost the popular vote by 3 million and won PA,WI and MI by a COMBINED 78,000 votes out of over 13 million votes.Since than democrats have gotten energized,the never Hillary/Bernie or bust stay at home or vote for Jill Stein democrats are deeply regretting their decisions.Trump approval ratings have gone down,4 reliably safe gerrymandered republican districts that were won in Nov by 16-31 points were all won by less than 7 points less than a year later.2020 will resemble 2008.
Trump lost the popular vote because he was running a campaign to win- which unless you are special like Hillary- is based on electoral votes. Refer to the Constitution for more on this So he did not spend a lot of time campaigning in California- duh.
Unfortunately, the Russians prevented Hillary from campaigning in Wisconsin - too many deplorables there. Yeh, damn Ruskies.
