Problem 1: His magnificent faith in government. Whether it be moon colonies or a costless war with Iran, his optimism towards every government act would embarass most Democrats.
Problem 2: low moral character. Say what you will about the institution of marriage, but the rules are clear. As we’re living in a sluggish police state I would prefer a chief executive who is not talented at rationalization and comfortable living with contradictions. Divorce is acceptable in a candidate, but since his platform is based on making the government bigger and bolder then his adultery disqualifies him.