Liberal ones do. Buddhism has no position on marriages in general as it does not consider them spiritual.
This falls into the broad category of personal choice supported by Buddhism in general. The general position against "sexual misconduct" appears to be related to an over concern with sexual involvementpleasures rather than any specific type.
If you are talking about non-Abrahamic religions in Asia, then the answer is no, although it is a topic of debate within Buddhism, and Liberal Buddhists support the idea, though Buddhists as a whole do not accept gay marriage.
Officially no, however there are significant numbers of Liberal Buddhists and Liberal Hindus that support marriage equality.
yes buddhist do celebrate marriage
There is no official teaching on this in Buddhism, although many liberal Buddhists support it. The fact is that Buddhism focuses on the individual's spirituality and does not consider marriage to be a spiritual issue.
Birth marriage and death are regarded largely as secular events by Buddhists, and no particuar tradition holds fast.
Support. The actor appeared in a video voicing his support for same-sex marriage.
No, Governor Fallin does not support gay marriage.
Support. The comedian says marriage equality is a no-brainer.
Support. No politician opposes homosexual marriage.
The ACLU and the NAACP are among those groups that support same-sex marriage.
I support same-sex marriage because I believe in equal civil rights for all.
No. The National Party of Australia does not support same-sex marriage.