I mean that's due to a disagreement in politics. He wasn't calling her a demonic satan-worshipping child trafficker like some on that side of the spectrum were.

Certainly, but that doesn't make it okay. In general things weren't rosy with his political career, his reputation for being a "maverick" that would buck party leadership was laughable since he ended up toeing the party line more often that not, even when he decided to speak out against {X} idiotic move they made he would still put a "Yea" in for the vote.

With that said I think he genuinely wanted what was best for the country, even if we never saw eye to eye on what "best" actually was.

Yep. There's good and bad in there. When people die, it's usual to recall the good more than the bad.

And? That's the entire point of checks and balances.

That isn't checks and balances. That's partisan bullshit.

His reason was not "because you're a democrat", so I'm not sure how you can make that claim.

“McCain spokesperson Rachael Dean later said that McCain "believes you can only judge people by their record, and Hillary Clinton has a clear record of supporting liberal judicial nominees."‘