U.S. Grant is one of the few Generals turned President, the only one other than Taylor and Eisenhower to never hold any other political office before becoming President, and at the time the youngest President. Sadly despite his superb battlefield skill, his political sense's were undeveloped and he trusted way too many people who didn't deserve it.
How can we make him one of the best (say top 5 or 10) President's in America history?