If by a “Liberal” they mean someone who looks ahead and not behind, someone who welcomes new ideas without rigid reactions, someone who cares about the welfare of the people — their health, their housing, their schools, their jobs, their civil rights, and their civil liberties — someone who believes we can break through the stalemate and suspicions that grip us in our policies abroad, if that is what they mean by a “Liberal,” then I’m proud to say I’m a “Liberal.”
John F. Kennedy accepting the NY Liberal Party Nomination, 1960

The adoption of the word ‘liberal’ as an insult in right-wing American politics is something I’ve never understood.