There are a lot of Ron Paul supporters out there who are saying that they will "write in" Ron's name in the general election if he is not the GOP candidate. I'm going to plead with you not to and here is why.
1. Most ballots are electronically scanned. The machine counting the votes could care less what you scribbled outside the little circles and you risk invalidating your ballot if the marks confuse the machine.
2. Write in votes are often not counted. You'll write in a name that nobody will ever tally up anywhere.
3. Because write-ins aren't counted or are ignored by the volunteer vote counters, your protest vote goes unheard, unseen and is ineffective.
Now, that doesn't mean vote for some status quo, tinker-around-the-edges, will probably keep everything mostly the same nominee person if that's who ends up on the ballot.
Instead, consider voting for whoever wins the Libertarian nomination. You'll most likely be voting for someone who probably believes 95% or more of what Ron Paul does, the vote totals get reported which allows the two old entrenched parties to see how many people opposed their candidate(s) and it will be easier to tabulate how much better the Republicans could have done with a more libertarian leaning, Ron Paul candidate.
In May, the Libertarian Party will be meeting in Las Vegas for their national convention and nominating their presidential candidate. Former New Mexico Governor Gary Johnson is probably the front runner to win the nomination, but there are other candidates including, but not limited to, R. Lee Wrights and RJ Harris.