I believe that 33% of Americans think Obama is the worst president. I certainly don't believe that statistic is worth the sensationalist headlines. Isn't that only a little bit higher than the percentage of birthers?
Also, as already pointed out, Dubya and Nixon had to compete for Democratic/left-leaning votes whereas the right wingers had an easy choice.
Nixon was President a long time ago. Anyone under 40 wasn't born or doesn't have many memories of the Nixon years.
And if 30-40 year old presidencies are fair game, Obama had to compete with Jimmy Carter for Republican/right-leaning votes. Carter is still is one of the worst, least effective, jokes of a President since World War II. He had weak foreign policy during a time of high gas prices, high unemployment, an alien invasion and general malaise. Sound familiar?
Yep, and Republicans picking Obama over Carter are being hackish.