Which Democratic and which Republican President do you consider the worst since Truman and why? In fairness, exclude Obama since he has not completed his term. On the Republican side, I came down to two before deciding, Nixon and Bush 41. Bush because he ws the first to start the liberal trend in the Republican Party after Reagan left office and his going back on his tax pledge. Although I thought Nixon to be a brilliant man in foreign policy, his economic policy tended to involve government in the free market. I finally chose Nixon as the worst, because I consider Bush to be a man of integrity. Nixon was a curious mix of good and paranoia, and would break the law to achieve power. On the Democrat side, there are lots of choices. I thought about Kennedy and the women, but his economic policies and some of his foreign policies were good. Although Carter was a decent man, he had no leadership ability. Clinton was Clinton, and his main achievement was working with the Republican Congress to achieve a fairly good economy. To me, the worst Democrat President was Lyndon Johnson. He expanded government greatly, escalated Vietnam on a bogus incident, was a political thug, and presided over the greatest amount of racial and social turmoil in American history.