Actor George Clooney has said that he believes the issue of gay marriage has lost its divisive political edge.

Clooney and Brad Pitt on Saturday led an all-star cast in the Los Angeles reading of 8, a play based on the trial over the constitutionality of California's gay marriage ban, Proposition 8.

8, which was written by Milk scribe Dustin Lance Black, raised more than $2 million in its Los Angeles premier, more than double what it raised during its Broadway premier. (Watch the reading here.)

In comments to The Hollywood Reporter following the performance, Clooney said that he supports marriage equality because “it's important to be on the right side of history. In 20 years, I don't want anyone to wonder where I stood. At some point people are going to look back and wonder why this was ever an issue.”

Clooney added that already the issue had lost much of its controversy, recalling that “eight years ago, when my dad (television journalist Nick Clooney) was running for Congress in Kentucky, this was used as a wedge issue to help defeat him. It's not a wedge issue anymore.”

(Related: George Clooney doesn't care if people think he's gay.)