In October 1960, when King Jr. was arrested at a peaceful sit-in in Atlanta, Robert F. Kennedy, brother and aide to the Democratic presidential nominee John F. Kennedy, telephoned the judge and helped secure his release. Although King Sr. had previously opposed John Kennedy because he was a Catholic, he expressed his appreciation for these calls and switched his support to Kennedy. Until this time, King Sr. had been a lifelong registered Republican, and had endorsed Republican Richard Nixon before switching to endorse Kennedy.