[HandBasketHell]

Failing that, progressives say their only method of retaliation would be to capture the White House and Congress and add seats to the Supreme Court.

...and then watch as Republicans play the same trick themselves later.

Republicans will never get in the White House again if the Dems pack the court. Every legislative measure enacted by Republicans will be challenged and overturned by a renegade SCOTUS.

[AnotherUnixGeek]

Republicans will never get in the White House again if the Dems pack the court.

All it takes is Republicans winning the House and Senate with a veto-proof majority. Then they can add as many justices as needed to build their own majority in the SC. Then the Democrats can do it when it's their turn and eventually we'll have a SC as big as the House of Representatives.