I would say that federal government should stay out of both issues. For gays, I would probably say to give them a license, but do not require religious denominations to go against their belief system and force them to perform marriages.
If I had to choose legal abortions, gay marriage, or 2nd amendment. The 2nd amendment for me. The 2nd amendment provides a society with the right to preserve our constitutional right to defend ourselves from a government run amok with power. Even if it would be a loosing battle. At stake is the liberty and freedom of all Americans. Personally,the abortion rights and gay marriage is not a personal crusade for me. Both are "NA" for me. LOL