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Indeed. I disagree with much of his politics, and particularly his tendency to support armed intervention. That said, he undoubtedly had the courage to follow his convictions, even where that ran against party lines and was prepared to talk to his political opponents in order to pursue what he thought was the correct way forwards. While therefore I'm not going to put him on a pedestal as a paragon of virtue, I'm equally not going to write him off as some comic book arch villian. Unfortunately, shades of grey and a balanced viewpoint don't seem fashionable in today's political discourse. Everything has to be simplified down to a good/bad duality.
One example is his voting against the repeal of Obamacare.
He knew he would be vilified by his party for it. He did it because he thought it was the right thing to do.
You can see videos of him casting his vote. Mitch McConnell is behind and looks like he wants to kill McCain, right there on the floor of the Senate.