Davidson had 312 yards passing for the Tigers (6-0, 3-0 Ivy League), who have a 16-game winning streak. Collin Eaddy ran for 110 yards and a touchdown and caught a pass for another score.
Davidson threw a 13-yard touchdown pass to Dylan Classi, who made a diving catch in the end zone to give the Tigers a 30-21 lead with 3:16 remaining. The score came three plays after a 28-yard interception return by Matthew Winston.
Princeton jumped to a 10-0 lead in the first quarter on Davidson's 13-yard touchdown throw to Classi followed by Tavish Rice's 46-yard field goal. Harvard scored twice in the second quarter to lead 14-10 at halftime.
Eaddy scored twice in the third on a 31-yard pass from Davidson and a 1-yard run to give the Tigers a 23-14 advantage with 3:45 left in the quarter.
Jake Smith threw for 289 yards and three touchdowns for the Crimson (4-2, 2-1), but was intercepted three times.
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