Hillary is a centrist on the spectrum of US politics. She is to the right of the Democratic party's liberal base and sanders type independents, but to the left of most republicans in congress in that she supports raising the minimum wage, believes in climate change, and supports some sort of immigration reform. Those might seem like paltry demonstrations of left politics to you, but in the current game, that is center-left. For me, the gap between someone who doesn't believe in man-made climate change at all and someone who does and is willing to do at least something about it (even if that means merely upholding the paris treaty), is bigger and more important than the gap between someone who wants drastic action on climate change and someone who doesn't but still believes in it.
Words do not indicate action, but they do indicate political allegiance. Even if Clinton's still to the right of most people on CD, she's more beholden to them than to anyone on breitbart, because of affiliation. The mere fact that Sanders was able to drag Clinton leftward on the democratic platform is a testament to this.
Trump does pretty poorly in debates, and this is in front of an audience that will be much less receptive to his bombastic style.