WASHINGTON (AP) — Patrick Caddell, the pollster who helped propel Jimmy Carter in his longshot bid to win the presidency and later distanced himself from Democrats, has died, a colleague said Saturday night. He was 68.

Caddell died Saturday in Charleston, South Carolina, after suffering a stroke. That’s according to Professor Kendra Stewart of the College of Charleston, who confirmed the death to The Associated Press.

After working with Democrats in the 1970s and 1980s, Caddell eventually drifted away from the Democratic Party and began advising supporters of Republican Donald Trump and was a contributor to Fox News for a time.

Caddell worked for 1972 Democratic nominee George McGovern, then joined with Carter in the mid-1970s to develop a campaign strategy to overcome the cynicism spawned by the Vietnam War and Watergate. In an oral history for the University of Virginia’s Miller Center, Caddell said Carter’s best bet was to present himself as an outsider who could help heal the country.

As a student at Harvard, Caddell had studied Southern politics and was helpful to Carter and his close advisers as they studied how to maneuver their campaign between the competing forces of the McGovern liberals and supporters of conservative firebrand George Wallace.