Strongly for it. I am straight but have several queer friends who are married/getting married and I am grateful that we live in a state that supports the equal rights of all citizens regardless of their gender, race or sexual preference.
I'm firmly NOT for Civil Unions (does separate but equal sound familiar?), if it's the same thing how about we give gay people "marriage" and we straight folks take "civil unions"? My favorite is the "sanctity of marriage" argument, which is an obnoxious way of ignoring the fact that straight marriage has been an extremely rocky affair for decades. Nearly half of all straight marriages end in divorce, and if your gay neighbors get married it has nothing to do with your own marriage.
The banning of gay marriage is an archetype of an antiquated belief system, based off of religious views that shouldn't be used to legislate people's civil rights. Same as when it it was illegal to marry interracially. Anyone who believes gay marriage is wrong probably thinks being gay is wrong, if that is not the case I'm interested to hear it.
I believe in equality for all people.