President Barack Obama has endorsed the congressman who became a Internet sensation last month after saying he was worried the island of Guam could "tip over and capsize."

Rep. Hank Johnson (D-Ga.) made the comment, first reported by The Hill, during a hearing on the U.S. Navy's Pacific fleet. The YouTube video of Johnson speaking went viral almost overnight, and by late Thursday had been viewed more than half a million times.

Following the uproar over the remark, Johnson issued a statement explaining that his "subtle humor" was "obviously a metaphorical reference." Nevertheless, the comments damaged his credibility, and caused pundits to speculate that the lawmaker was suffering from side effects of medication he takes to treat Hepatitis C.

Johnson has two Democratic primary challengers for the DeKalb County seat, which he has held since 2007. An endorsement from Obama, who enjoys nearly 90 percent approval ratings among African Americans, is expected to provide a boost to Johnson in his majority-black district.