The Democratic-leaning public affairs firm Global Strategy Group has hired Bill Burton, a longtime ally of President Obama's who most recently ran the pro-Obama super-PAC Priorities USA.

Burton was an early hire onto Obama's presidential campaign, working as national press secretary on the campaign and then deputy White House press secretary at the beginning of Obama's first term. Before that he was communications director for the Democratic Congressional Campaign Committee under then-Rep. Rahm Emanuel (D-Ill.).

"GSG is an outstanding, dynamic and rapidly growing firm. I couldn't be more excited to join such a talented team," Burton said in a statement. "I look forward to building on our strong presence in Washington, and to extending GSG’s unrivaled combination of strategic thinking and sharp execution that the firm provides for its clients."

The hire marks a shift in the super-PAC world, and comes in the same week that Obama for America, the president's campaign organization, shifts to being a nonprofit outside group.