Ron Paul has authored legislation saying that life begins at conception, to prevent federal money from being spent on family planning (that would include contraception), and has tried to amend the Constitution to "guarantee the right to life." (from dailykos)
Gee, I wonder where he gets those idea? It's not because he's an atheist, so I'm guessing it's not from a "rational" source.
If you are a woman and an atheist and this is the best candidate you can do, look elsewhere. Hell, vote for a real Libertarian rather than vote to have your reproductive freedom stolen from you.