Newt has been on Hannity's show just about every week for years. Thompson was a huge news story last week, so Hannity could hardly ignore him. Romney is only conservative when you compare him to a liberal like Rudy. I'm not aware of him having Duncan Hunter on his show (but I may be wrong).
BUT MY MAIN PROBLEM IS THAT HANNITY TOTALLY WHITEWASHED RUDY'S LIBERALISM.
hannity is willing to look past rudy's liberalism because he thinks any one running as a republican is better than hillary, which may be the case, but I understand your point- there is no reason to settle for a liberal in conservative clothing when we have a chance to get the real deal.
He said he is doing that as a new aegment every Monday and Thursday and put out an open invitation to anybody running for President to take an hour including Obama and Shrillery... He said it's for Listeners to ask the questions... So I would think Duncan can have his time too if he wants it...