.... is becoming.

Boomers are are in decline. Meanwhile...

Millennials recently passed them in number and Gen X and Xenials are getting older and vote-ier.

It's the long game that Republicans are—and should be—most worried about. It's almost certainly why they're increasingly willing to game the system/act in a generally antidemocratic fashion or even outright cheat.
I kind of get that. It's politics and, historically, parties who flirt with authoritarianism are more likely to go all-in on dirty tricks.

What's so concerning to me is that their supporters are increasingly willing to accept.....or even cheer it on.