Obama's at 35-59 Disapproval. Also, he has a 14-53 strongly Disapproval rating, which is the worst I've ever seen for him anywhere (though this is a university poll).
University poll conducted over the internet. The sample is supposedly demographically matched, but the people who are polled, have previously volunteered to participate in the political and consumer surveys by Yougov. So you can rest assured that there were representative numbers of Blacks, Hispanics, Anglos, women, men, old, young, etc. who eagerly volunteered to be polled.
The Libertarian candidates ran up around 10% of the vote in this poll of the willing.