I have never read the name Hillary and the word moderate in the same sentence before...that just doesn't pass the straight face test.
She ain't no lefty, not even as much as Sanders. She's solidly with the discredited pro-corporate, Wall Street, neoliberal, free-trade, Washington Consensus view of political economy, not much distinguishes her from the Pubs in that regard but a friendlier view of the welfare state. She's maybe five degrees to the left of Bill at most, and there ain't no other word than "moderate" for Bill.
The "center" is nowhere near where you seem to think it is.