Let us examine Andrew Sullivan. He has endorse ONE Republican Presidential candidate in the last four election cycles - Bush in 2000. He endorsed Kerry in 2004, Obama in 2008, and Obama in 2012. He also supported the Democrat Party in 2010. Someone correct me if I'm wrong, but I don't believe he's ever issued endorsements of the Republican Party. Which makes more sense, a conservative who 75% percent of the time finds the right's candidates too bad to support, or a liberal who 25% percent of the time finds the left's candidates too bad to support?
He was editor of the left wing New Republic. One could perhaps argue that Forbes could be wrong about Sullivan without being fitted for a padded helmet, but it escapes me how anyone could argue that the New Republic could be fooled into hiring a conservative to edit their magazine. (Stop me if we're now pretending that the New Republic is a conservative magazine.) Incidentally, I read Sullivan during this phase of his career in the New Republic; he and Paglia were my favorites there.
He gives out six insult awards. Four of these, the Hugh Hewitt, John Derbyshire, Michelle Malkin, and Dick Morris awards, are given either exclusively or overwhelmingly to conservatives. Only two, the Paul Begala and Michael Moore awards, are similarly aimed at the left.
He supported the Iraq war when it was a disaster and opposed it when it had been turned around. Granted, perhaps this is an honest position, but at the very least it's odd.
He supposedly opposes laws like the Employment Non-Discrimination Act providing gays with extra legal protection, but his criticisms were largely directed at those who refused to vote for it because it didn't go far enough.
I used to read Sullivan regularly, both in print (New Yorker - although honestly I bought mostly issues with Paglia articles) on digitally via the Drudge Report front page. I agree with him on many issues, but those are almost all issues where I agree with the left. I came to the conclusion that his posturing as a conservative is a basic dishonesty designed to give his liberal arguments more weight; due to that I stopped reading his work.
Were he to identify himself as a libertarian, I'd have no problem with him, even though I disagree on many issues. (As Neil Boortz says, if two people agree on everything then one of them is unnecessary.) But pretending to be a conservative while attacking virtually every conservative politician and position is just fundamentally dishonest.