I am 10000% for gay marriage. As far as I am concerned love is love, regardless of gender.
The emotions you feel when in love are the same regardless of your genitalia. So if you love someone enough that you want to spend the rest of your life with them go for it.
I hate people who say that allowing same sex couples to marry "ruins the sanctity of marriage", what a load of shit! People who get married purely for money or to allow someone to get a Visa or celebrities that are married for 2 months for publicity are people who ruin the sanctity of marriage!