New York Magazine's website has an article celebrating 50 years since John Lindsay was elected mayor of New York City. It briefly describes what made him different and memorable, backed up by some testimonials from now famous or influential people who worked on his campaigns or mayor's office.
I met or at least heard John Lindsay when he was a member of the US House of Representatives, before he ran for mayor. I must have read an article about him, describing him as the Republican's JFK. (In the above mentioned piece, Bob Dole talks about serving with him in Congress in the mid-60s, the time of Civil Rights and the War on Poverty.) Lindsay spoke at a college near me (Seton Hill) and I went, and shook hands with him afterwards as I recall. (But I could be wrong, because I think I took a date. Who takes a date to a speech by a congressman from another state? In high school, me.)
This article describes Lindsay as frustrated by New York unions as well as unsympathetic administrations in Albany and Washington, but excelling in personal leadership--walking black neighborhoods almost every day, talking to people, getting involved personally in a jail hostage situation and thereby preventing bloodshed.
Lindsay was the Republican JFK (though he later switched to the Democratic party) also in that he inspired a generation, and is remembered with such gratitude and lasting admiration.