Sagan died in 1996. "New Atheism" that brown nosed neocons like Christopher Hitches and Sam Harris was a thing in the early 2000s. Also Sagan was merely agnostic, not Atheist, and he was born to a working class Russian Jewish family in New York in the 30s. He never had that reactionary vibe. He was kinda lib on some things but his whole politics can be summed up as: science good, give people what they need to survive, avoid nuclear war with USSR. Ted Turner asked him if he was a Socialist when he was dying of cancer and he said "I'm not sure what a Socialist is" but then proceeded to describe what are essentially standard DSA type politics. I'd say Sagan's politics are pretty close to someone like Bernie Sanders rather than Sam Harris.