John Vliet Lindsay was an American politician and lawyer. During his political career, Lindsay was a U.S. congressman, mayor of New York City, and candidate for U.S. president. He was also a regular guest host of Good Morning America. John Vliet Lindsay was an American politician and lawyer. During his political career, Lindsay was a U.S. congressman, mayor of New York City, and candidate for U.S. president. He was also a regular guest host of Good Morning America.