Charles Murray, the co-author of the controversial, best-selling 1994 book The Bell Curve, said, “What the hell,” and voted for Maryland's Question 6, which upheld a gay marriage law approved by lawmakers.

“So I stared at MD's gay marriage prop, greatly conflicted between strategic objections and gay friends in loving relationships, and then said 'What the hell,' and voted yes,” Murray said in a series of tweets. “The gay couples I know behave as the Jonathan Rauch's of the world said they would. So I gave up.”

The 69-year-old Murray, who currently works as a fellow at the American Enterprise Institute, a conservative think tank in Washington, D.C., first gained fame with the 1984 publication of Losing Ground: American Social Policy 1950-1980, in which he discusses the welfare system.

In The Bell Curve: Intelligence and Class Structure in American Life, Murray and Harvard professor Richard J. Herrnstein argue that intelligence is dividing American society. The pair were accused of supporting scientific racism.

With passage of Question 6 the marriage law takes effect on January 1.