No, I am not.
A "libertarian" whether small "l" or big "L" is not a "Conservative" by definition. Please do not attempt to argue the labels are interchangable, if that were true two distinct labels wouldn't exist.
Agreed on Sullivan.
As for the President? He's conservative on some issues, not so on others. Actually I've always maintained he doesn't fit an ideological sterotype even though folks today find it convenient to designate others as Liberal or conservative. Unlike moderates, he doesn't define label because he lacks willingness to take a position. Rather he just takes it issue by issue which results in a grey area of strong beliefs no one can adequately attribute a label to. Perhaps "Independent" which is sort of "blah" in meaning.
I don't believe the labels are interchangable, but it is possible to be both a libertarian and a conservative.