WATCH: Debunking Myths About the U.S. President's State of the Union

Does a 'designated survivor' really have to remain behind in case of an attack? NBC's Chuck Todd fact-checks some commonly held beliefs about one of the biggest political speeches of the year.

Obama speaking at the White House in Washington, November 20, 2014.Credit: Reuters

REUTERS -  Looking to burnish his legacy with two years left in office, President Barak Obama will appear before a joint session of Congress in the well of the House of Representatives at 9 p.m. The speech will be his best opportunity of the year to command the attention of millions of Americans watching on television.