

You’re wrong there. A senate parliamentary can be removed by the majority leader.
To amend the constitution take a 2/3rds majority vote, 2/3rds of states ratifying an amendment, or a constitutional convention being called and amendments voted on.
Of course these are just the legal means. Ignoring it and doing what you want seems to be working just fine for them
We actually did, his name was Franklin D. Roosevelt.
Sure if we hold him up to today’s standards not a progressive by any means, but he campaigned on working class issues and helped steer the country out of the depression. He created virtually all our modern safety nets or their predecessors.
He was so popular a president that Congress amended the constitution to ensure no other president could have more than 2 terms. He was so popular congress was afraid it threatened the power of their branch of government.
Running on and actually accomplishing worker centric policy works.
And to fend of the inevitable yes he was not that progressive by today’s measures and had a mountain of flaws. But his accomplishments were revolutionary for the country in his time.