Known for his role in some of Hollywood’s top blockbusters, George Clooney is no stranger to Washington.  While Clooney himself is not actually a registered lobbyist, he has visited the White House to discuss his favorite issue: the genocide in Darfur.  Just over a month after President Obama was inaugurated, Clooney visited the president and Vice President Biden to discuss the crisis in the region.

While not as outwardly vocal as other celebrity lobbyists, including Lady Gaga, Clooney, through “Not on Our Watch,” a monitoring organization he co-founded along with fellow Ocean’s trilogy actors Don Cheadle and Matt Damon, and Brad Pitt, David Pressman, and Jerry Weintraub, seeks “to focus global attention and resources towards putting an end to mass atrocities around the world,” according to the organization’s website.

The organization is a grassroots organization, urging citizens to contact elected officials, including President Obama, and encourage the US to take action on these issues.