Pat Caddell gave Carter the results of the final poll late on the night before the election, as Jimmy was traveling back east from a rally in Seattle. Caddell had it tied Saturday, Reagan +5 Sunday night, and Reagan +10 Monday night. Jimmy thought he would win until that phone call. He then sat alone on the plane and cried.
Source: Craig Shirley, Rendezvous with Destiny (best book about a campaign I have ever read).