Frankly, there are a large number of people who actually agree with the libertarians but can't seem to vote for them given their lack of party strength. Unless you are a hopeless Democrat, how can you not approve of smaller government, lower taxes, the elimination of SS, the Constitution and the power of the individual.
Bush and the current batch of scumholes in Congress have continued to screw the American tax payer over the past few years. Yes, we got some tax cuts but you cannot increase entitlement, education and other non-defense spending while you are at it.
The Libertarians (IMO) shot themselves in the foot by opposing the War in Iraq. Many of them sounded just like anti-Bush Democrats in their rhetoric on the war, and I think most libertarian/conservatives who are willing to give Libertarian candidates a look didn't care for what they saw last year. I'd have gladly voted for Georgia's Libertarian Senate candidate over Johnny Isakson last year if he hadn't sounded like Teddy Kennedy when it came to Iraq.