Obama's 'Drop the Mic' Moment at the State of the Union

President Barack Obama delivers his State of the Union address to a joint session of the U.S. Congress on Capitol Hill in Washington, January 20, 2015.
Jonathan Ernst | Reuters
President Barack Obama delivers his State of the Union address to a joint session of the U.S. Congress on Capitol Hill in Washington, January 20, 2015.

It may be the only line Americans remember from the 2015 State of the Union address.

Read MoreState of the Union: 'Shadow of crisis has passed'

Calling for political unity, President Barack Obama declared to the GOP-controlled Congress that he has "no more campaigns to run."

More from NBC News:
Obama demands 'better politics' of Congress
'Loud and clear': Republicans respond to Obama's SOTU
Hillary: Obama pointed way to 'economy that works for all'

Some Republicans in the chamber applauded the idea, but the president was poised with a quick retort.

"I know because I won both of them," he said, referring to his two successful presidential campaigns.

Read MoreStocks that may get a State of the Union boost

Even Republican Sen. John McCain, his rival in the 2008 election, applauded the joke.

Obama: I have no more campaigns to run
Obama: I have no more campaigns to run