Since libertarians believe in a complete return to the Constitutionally-limited government of the Founders, it could be argued that libertarians are the only genuine conservatives around today
You're just defining conservative ad hoc. Libertarianism is on a different point of the scale of political philosophy. One who wants a radical change to libertarianism, certainly in its absolute form, would very much abuse the literal meaning of the word 'conservative" and should not claim it as their favored label.
My advice is to support the candidate you really want IN THE PRIMARIES, then go with the PARTY candidate that best represents your interests in the general election.
If you're a libertarian and your man didn't get the President nomination of one of the two main parties, I think your best bet is to vote libertarian on local levels, and build it up from the ground up. At the presidential level, I consider where my vote will best result in the interests of what I think is best for the country. Frequently that means voting for a Bush over a Kerry and ignoring the Libertarian if a vote for the Libertarian means Kerry gets elected and gets to nominate Kerry-types to the Supreme court.
Until recently, I had been going to a local place to get my hair cut. The salon is owned by two men, one who manages the place and the other is a stylist. They're openly gay. They've been together longer than Mrs. M1911 and I have been married and our 16th anniversary is coming up shortly.
I gave them my best wishes when they got married. They're happy and productive members of society. My marriage is just as secure after they got married as it was before.
As for comparing Ron Paul's chances to Jimmy Carter, sorry, but that won't fly. Presidential politics have changed greatly in the past 25 years. Years back, there was more time between primaries and the early primaries were in small states. Someone with little money and name recognition had a chance back then to do well in an early primary and then attract enough money to keep going.
This time around, the primary process has become very front-loaded. Many larger states have early primaries. The only way to campaign effectively in those states is on TV and TV adds cost a lot of money. Consequently it is far less likely that an unknown with little money will be able to break out of the pack.
Ron Paul has zero chance of becoming the Republican nominee.