Why "Everyone Laughed" at John McCain, Even Obama Credit: Julia Schmalz/Bloomberg via Getty Images President Obama's meeting with Democratic senators had an unexpected visitor. Sen. John McCain, who has served in the upper chamber since 1987 after two terms in the House, apparently got lost and interrupted the meeting. "He opened the wrong door and the president and everyone laughed," a spokesman for the Arizona Republican said. He didn't participate in the meeting. The mistake might have been an easy one to make because Republicans regularly hold their weekly conference in the Lyndon B. Johnson room, where the president was huddling with Senate Democrats today. Read more about President Obama's meeting with Democrats on Capitol Hill. As news of the blunder made its rounds online, McCain chimed in via Twitter: To be clear: I opened the wrong door, looked in and saw the President, said "my mistake" and everybody laughed. Lighten up everybody... John McCain (@SenJohnMcCain) July 31, 2013