I love The Power Broker (Robert Caro), about Robert Moses, and What It Takes (Richard Ben Cramer), about the 1988 presidential election. I don’t know how old you are, but if you’re old enough to remember the actual election it’s probably more meaningful- to me, it was all ancient history :). Both completely riveting.
Both are also doorstoppers, so they’re great for a nice long Shabbos afternoon.