This is because the Roberts' Court legislated from the bench, they are an activist cabal of conservatives. Google Federalist Society.
The five Right Wing Supreme Court justices changed campaign laws that were decided for centuries by Congress. Conservatives complain about ‘activist judges’ all the time. Did the right wing media notice? Nope.
These 18 Senators are on the wrong side of history. Notice they are all Republicans. The completely lazy “both parties are to blame” bullshit can die another death.