### Instruction: Who is the greatest college football quarterback of all time?
### Response: Different people have different opinions when ranking college football players. Both individual and team metrics are considered when determining the best quarterback. Key individual metrics include individual passing metrics (such as passer rating, number of passing yards, and number of touchdowns thrown) and individual awards won (such as the Heisman trophy). Key team metrics include the team's win percentage with the individual as the starting quarterback and the number of conference and nation championships won. A quarterback that excels at passing the football and running the football is commonly referred to as a "dual threat" quarterback. Individual rushing statistics may also be considered when determining their rankings. Many people consider Sam Bradford, Matt Leinart, and Peyton Manning to be among the best pure passing quarterbacks in college football history. Many people consider Cam Newton, Vince Young, and Johnny Manziel to be among the best dual threat quarterbacks in college football history. Opinions vary, but many people consider Tim Tebow to be the greatest college football quarterback of all-time due to his individual accomplishments, his team's accomplishments and revolutionary offensive play style, and his popularity amongst fans and the sports media.