Team of Rivals (Abraham Lincoln) by Doris Kearns Goodwin
Grant by Ron Chernow
Alexander Hamilton by Ron Chernow
The Path to Power (Lyndon Johnson) by Robert Caro
1776 by David McCullough
John Adams by David McCullough
The Power Broker by Robert Caro (fascinating read that provides lots of insights into New York politics)
Also good, but maybe not at the level of those above in my view:
The Bully Pulpit by Doris Kearns Goodwin
Thomas Jefferson: The Art of Power by Jon Meacham