"And to be honest, I simply don't believe that a lack of legislation authorizing gay marriage constitutes discrimination justifying federal intervention for "human rights" or "equal protection." "
If that were the only issue, maybe. But there are states who are actively passing laws and attemtpign to get constitutional amendments that *ban* gay marriage. It's not that gay marriage isn't spelled out as a right, but that it is under attack *by several states*. Dude, seriously, do you not keep up with the news in other states?
http://www.ncsl.org/issues-research/human-services/same-sex-marriage-overview.aspx
State law and/or constitutional provision limits marriage to relationships between a man and a woman:
Alabama, Alaska, Arizona, Arkansas, Colorado, Delaware, Florida, Georgia, Hawaii, Idaho, Illinois, Indiana, Kansas, Kentucky, Louisiana, Maine, Maryland, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia, Wisconsin, Wyoming
That's 39 states, nearly 80% of them. It's an endemic problem and the Federal government must step in to declare these laws and amendments to be a violation of the US Constitution.
And it doesn't just provide a problem for gays moving between states or living in those states, but companies who conduct business in different states have to deal with enough issues without having to add the state requirements of what "couples" their HR departments can and cannot recognize based upon the state they are incorporated in and/or their employees live and do business in.