Americans also voted on more than a hundred ballot measures nationwide. In South Dakota, voters rejected a ban on abortions. Michigan voters approved the use of medical marijuana. Colorado voters defeated a measure that would have defined life as beginning at conception. In Massachusetts, a ballot initiative calling for the decriminalization of marijuana has passed. The most closely watched initiatives dealt with gay marriage. In California, Proposition 8 appears headed for approval. The Proposition would amend the California constitution to specify that only marriage between a man and a woman is valid or recognized in California. Voters also passed gay marriage bans in Arizona and Florida.