In 1996, as a freshman member of the House of Representatives, I wrote the Defense of Marriage Act, better known by its shorthand acronym, DOMA, than its legal title. The law has been a flash-point for those arguing for or against same-sex marriage ever since President Clinton signed it into law. Even President-elect Barack Obama has grappled with its language, meaning and impact.

I've wrestled with this issue for the last several years and come to the conclusion that DOMA is not working out as planned. In testifying before Congress against a federal marriage amendment, and more recently while making my case to skeptical Libertarians as to why I was worthy of their support as their party's presidential nominee, I have concluded that DOMA is neither meeting the principles of federalism it was supposed to, nor is its impact limited to federal law.

In effect, DOMA's language reflects one-way federalism: It protects only those states that don't want to accept a same-sex marriage granted by another state. Moreover, the heterosexual definition of marriage for purposes of federal laws -- including, immigration, Social Security survivor rights and veteran's benefits -- has become a de facto club used to limit, if not thwart, the ability of a state to choose to recognize same-sex unions.

In 2006, when then-Sen. Obama voted against the Federal Marriage Amendment, he said, "Decisions about marriage should be left to the states." He was right then; and as I have come to realize, he is right now in concluding that DOMA has to go. If one truly believes in federalism and the primacy of state government over the federal, DOMA is simply incompatible with those notions.

Bob Barr represented the 7th District of Georgia in the House of Representatives from 1995 to 2003 and was the Libertarian Party's 2008 nominee for president.