"The ultimate significance of the Trump era in American history is still being written. If Democrats fail to act in the face of Republican efforts to insulate their power from voters, they will find themselves attempting to compete for an unrepresentative slice of the electorate, leaving the vulnerable constituencies on whom they currently rely without effective representation and democratic means of self-defense that the ballot provides."
A good explanation of why disenfranchising voters and blocking popular legislation is a good strategy for republicans.
New York Times