As you may recall Truman was extremely unpopular when he finally left Washington in 1953 thanks largely to the Korean War. Today however he is thought to have been a solidly good president a 'Near Great' even in the terminology of those surveys of historians they do every now and then.
Essentially I'm untrained so I just go with my imagination and try to put myself as solidly as I can into the shoes of whatever person I'm going to be playing.
When I first started acting I was about nine years old. I had never been to audition in my life and my agent sent me out. It was just a commercial for 'Harry Potter.' That was the first thing I ever went out for and I got the 'Harry Potter' commercial which was really cool but I didn't play Harry Potter.