1. America (the people of this federation of States) has/have not had a ruler since George III. Public servants may sometimes exercise executive power, but they are not correctly classified as "rulers."
2. As is clear from Jefferson's analysis (Declaration Of Independence--With Study Guide, a major part of George III's failure was in failing to protect his American subjects from the meddling of the British Parliament. In contrast, Obama has been the initiator of far more extreme abuses. There is frankly no way that he is less objectionable than was the British monarch.
Just some distinctions that should help to clarify the issues.
William Flax