This image provide by Alexander Arroyos, taken on Nov. 21, 1963, shows President John F. Kennedy and first lady Jacqueline Kennedy greeting Latino activists at a LULAC gala in Houston’s Rice Hotel. Historians say Kennedy’s appearance at the Rice Ballroom _ 49 years ago this week and the night before his assassination _ was likely the first time a U.S. president officially acknowledged Latinos as an important voting block. (AP Photo/Courtesy of Alexander Arroyos) UNCREDITED — ASSOCIATED PRESS