Link here. The article describes what the Democrats do when they make voting-by-mail legal.
[I]n Oregon’s vote-by-mail system, county elections offices don’t just sell your party registration and voting history, they also regularly inform campaigns of the status of the voter’s ballot, usually daily throughout Oregon’s lengthy 18-day voting window. Ballot harvesting is when campaigns determine exactly which voters have already turned in their ballots, and then they come after those who have not. Lots of phone calls, lots of door knocks, lots of robocalls. If you purposely wait to vote until the last day (voters have realized that many major scandals haven’t surfaced until the final days of a campaign), the efforts border on outright harassment.
In a primary election, most “1×4” and “2×4” voters are not as likely to vote. That’s when the unions go to work. Dozens and dozens of public employee union workers build and track voter files daily on Democrat-leaning voters. Then they turn their public employee armies loose to gin up votes for their candidates.
Imagine the knock at your front door. The union member offers you a flyer for their candidate, then asks if you’ve voted yet (they know you haven’t). Next they offer to wait while you fill out your ballot. Maybe then they offer to return your ballot envelope. (If you indicated a preference for the other primary candidate, do you think your ballot will really be delivered?)
None of this is illegal. All of it should be done by Republicans also, but then, the Republican Party has too often shown itself as cowardly wimps eager to lose. The result is that Democrats harvest a lot of extra mail-in votes. And I am sure they use the mail-in system to put their finger on the scale to disqualify or lose as many Republican votes as possible, as mailed ballots are so easy to manipulate.
This is their plan for November. They are now pushing for mail-in-voting nationwide, and will certainly get it in many more states before the election. In each case they will use it to up their vote count, as the Republican Party twiddles its thumbs.
It seems to me that rather than buy lots of stupid television ads, Trump and the Republicans should be investing in the same kind of door-by-door army, harvesting their own votes in this manner. It seems a far more effective way to win elections.