President Bush and the Republican Party are opposed. They tried to introduce a federal law to ban all gay marriages in the United States. The Republican party has a history of opposition to gay rights.
Mayor Adrian Fenty in DC is all for the idea. It would be a big obstacle to get past congress, but a major step forward. If there were a Democratic majority in congress, maybe in 2010.....
The Maine Marriage Alliance is fighting to get a constitutional amendment banning gay marriage.
Another argument put forward against gay marriage, is an idea supported by the United Nations Declaration on the Rights of the Child states that children have the right to be free from political influence (referring to sexual orientation).
Barack Obama opposes same sex marriage, even though much of his campaign donations came from wealthy homosexual individuals. He is a member of the United Church of Christ and believes marriage is a sacred union intended for a man and women exclusively.
John McCain is also opposed.