Newt Gingrich has bowed out of the Republican presidential race after Mitt Romney wrapped up the nomination with a string of victories last month. Speaking to supporters, Gingrich said he will back Romney because President Obama is “the most, radical leftist president” in U.S. history.

Newt Gingrich: “Today, I’m suspending the campaign, but suspending the campaign does not mean suspending citizenship. Callista and I are committed to be active citizens. We owe it to America. … As to the presidency, I’m asked sometimes, 'Is Mitt Romney conservative enough?' And my answer is simple: Compared to Barack Obama? You know, this is not a choice between Mitt Romney and Ronald Reagan. This is a choice between Mitt Romney and the most radical, leftist president in American history.”