Sen. Barack ObamaBarack Hussein ObamaGOP rep: North Korea wants Iran-type nuclear deal Dems fear lasting damage from Clinton-Sanders fight Iran's president warns US will pay 'high cost' if Trump ditches nuclear deal MORE (D-Ill.) began airing this presidential campaign ad in Iowa today. In it, Obama talks to a group of seniors about Social Security, saying the country needs an honest discussion to fix spending and revenue problems as the baby boomer generation retires.