It is a little more complex with Gary Johnson. Gary Johnson is more pro-life than the traditional libertarian party member. Please Please go to the link and check out a couple things. The most important thing is that Gary Johnson wants to overturn Roe v Wade and lets the states decide (which is also Ron Paul's position). Gary Johnson has said in the past that he would support a Constitutional amendment, but until we get one - it is a state issue.
It's not great abortion position, but it is still better than Romney/Obama's. At the end of the day, you have to consider everything. Good luck to you
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