Answer:
Jimmy Carter
Step-by-step explanation:
...the question especified "in one of the biggest presidential election landslides in history."
On November 4, 1980, Reagan carried 44 of 50 states and received 489 electoral votes to win the election. Jimmy Carter, the incumbent president, carried six states, as well as Washington, D.C., and received 49 electoral votes. Reagan won 50.7 percent of the popular vote, Carter took 41 percent, and Independent John B. Anderson (a liberal Republican) received 6.7 percent.