Oh, come on. Dick, hands down. Both for breadth and for intensity, because his negatives combined a loathing for what he stood for with loathing for him as a human being. Which is kinda rough considering the many policy achievements in his administration – and indeed enough people supported him to be reelected in a landslide just 2 years before bringing the house down onto himself. When people felt negatively about Nixon, it soaked them to the very core.
Too early to judge on Dubya, but it looks to me like although there may be great loathing and even hatred for what he does or stands for, on the personal level he is rather the target of being scorned or “despised” as a pigheaded intellectual lightweigh, rather than hated. However he still commands plurality support.
Bubba Clinton was widely popular, in terms of the Big Picture; however, for those who did/do hate him, the hatred burns like the fire of a thousand suns. Together with his First Family was a target of harsher personal insult than Reagan and his First Family in their time, but at the same time was top of the polls even more so than RR, all the way through-- best thing that can happen to a President is to have his 8 years coincide with a peacetime economic boom. The general view of Clinton is that of a bright guy with superstar charisma but fatally flawed character, while the Clintophobes see in Bill an abomination before the eyes of the Lord.
Poppy Bush: In the words of Roger Mudd, “the problem with George Bush is that he’s boring, boring, boring…”. He was not widely “hated”. He was not widely “loved”. He was just the President, and he really had nothing to offer beyond more of the same.
Ron: As far as I could tell, the people who felt negatively about Bonzo’s uncle, on the personal side were also of the not-so-much-hate as scorn or despise as an intellectual inferior, in a prefiguring of GWB; and on the policy side, for the greater number of Ronniephobes it was not so much hate as raw fear, namely that this red-baiting arms-racing supply-side cowboy would blunder us into WW3 and/or turn over the Judiciary to Jerry Falwell and/or just let people starve in the streets. Still, the Administration DID have a high “sleaze factor”, and there WAS a hard core of hard-line loathing of what Ron stood for, on the ideological left. But, again, the Gipper held top of the polls
Jimmy: Whenever, in the darkest days of Clinton, someone said that the People of America want a Presidents that tells the truth, I’m sure Mr. Carter punched the wall. Face it: the people of America will tar and feather any leader who gives them The Bad News. We want to be told we should win one for the Gipper even if it’s a bogus story. Carter had good positives as a human being even while in office, bless his lustful heart, but received lots of scorn, not all of it earned, as an executive.
Jerry Ford: Placeholder president. Not really hated or loved, tended to be ridiculed as a bumbler but considered meh as a leader, except that he earned a ton of negatives for pardoning Nixon… which was a lose/lose situation in any case. He caught only the start of the 1975-1980 period of American suckitude, leaving Carter to bear the brunt of it.