What does a party do when it can't win an election?

It cheats.  

Its partisans on the Supreme Court rule in favor of unlimited campaign spending by corporations, interest groups, and rich people.  

Its partisans on the Supreme Court then overturn “preclearance” in the Voting Rights Act, and states immediately take advantage by restricting voting rights.

Then its partisans on the Supreme Court give the green light to political gerrymandering like we have in Pennsylvania, ruling that the issue was “nonjudiciable.”

Republican legislatures enact photo ID requirements.  They institute purges of voters.  They close polling sites.  They hold a Wisconsin primary in the middle of a pandemic, and limit polling sites in Democratic areas.

Now they are opposing vote by mail.  Trump, who votes by mail, says “Tremendous potential for voter fraud, and for whatever reason, doesn’t work out well for Republicans.”  Part of that statement is a lie.  There is no potential for voter fraud.  Part of that statement is true.  In almost every case, the more people who vote, the more likely the Democrats are to win, and Republicans know it.