Yes, Democrats might have occasionally pushed things a bit in previous Congresses, but I know for a fact that you cannot point to anything Democrats have ever done that's as egregious as Republicans actively colluding to a) prevent a sitting President from being allowed to appoint a new Supreme Court Justice to the bench, or b) prevent any legislation the opposing party proposes from being brought to the floor in any way, shape, or form for years, purely for political gain.