Although I didn't say "easy", it is probably a lot easier than getting through the Republican gauntlet that they call a primary.
In 1980, independent candidate John Anderson got on the ballot in all 50 states. He spent several million dollars to do it. The number of required petition signatures at that time was maybe half of what it is now. However, Anderson's following hardly compares to Ron Paul's following today.
My state's requirement is 30,000 signatures, out of a population of 10,000,000. I was told this morning that there are 10,000 Campaign For Liberty members in the state. See if these figures might lead you to the same conclusion that I've arrived at.