SIMI VALLEY, CA - MARCH 11:  Former first lady Rosalynn Carter (L), Caroline Kennedy and Democratic presidential candidate Hillary Clinton (R) follow the casket during funeral and burial services for former first lady Nancy Reagan at the Ronald Reagan Presidential Library on March 11, 2016 in Simi Valley, California. The first lady is being buried at the library next to her husband, who died on June 5, 2004. Nancy Reagan died of heart failure at the age of 94. (Photo by David McNew/Getty Images)