I don't see how her win tonight specifically makes her that much better of a politician than she was yesterday. Sure, it's technically "historic", but then wasn't Sanders' win in New Hampshire also "historic"?
The media never says Bernie Sanders is a terrible politician.
And just for some context, the media acts as if Donald Trump and Ted Cruz are the most talented politicians on earth because they got the most votes in Iowa caucus history.
Okay, but the media's going to be critical of Clinton either way, however unfair that might be. What is it specifically about tonight that makes her a great politician? Sure, it was an enormous win (though it was one of her best states), but a lopsided win in one contest doesn't make her a great politician. If she wins the nomination, on the other hand, you will probably hear the word "historic."
I don't think she's a bad politician, but she's definitely far from perfect. It looks like she'll win the nomination this time, but by all accounts, she should've won eight years ago.