solarbird has
an entry about Referendum 71 that you should read, if you don't know about it already. It's important to note that if the petitioners succeed in getting enough valid signatures, which seems likely, it takes the domestic partnership law off the books, and you need to vote YES on the referendum to put it back on.
It's also important to note that if you read the PI blog entry she linked to, you'll be doing yourself a favor by not reading the comments.
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