By Pat Forde, ESPN.com

Editor's note: Each week, ESPN.com asks one of its Heisman Watch voters to explain his/her picks. You can register your vote at 2008 Vote Heisman.

1. Graham Harrell -- He's not just a system guy -- he's a winner on a level the Red Raiders haven't seen before, which makes all the individual stats really mean something. Ever since Harrell ended former coach Glen Mason's career at Minnesota with that ridiculous comeback in the Insight Bowl in 2006, leading the Red Raiders back from a 31-point, third-quarter deficit, he's shown that "it" quality that great quarterbacks need. The tough choice is whether to include Harrell or receiver Michael Crabtree on the ballot.

2. Colt McCoy -- He's had a brilliant junior season, and at times has carried the Texas offense single-handedly. Even in his one poor performance, at Texas Tech, he regrouped and led the Longhorns back from a big deficit for a brief lead and a chance to win. What's not to love about a 77 percent accuracy rate, more than 3,600 yards of total offense and 38 touchdowns rushing and passing?

3. Sam Bradford -- The only thing Bradford has done wrong is to be in the same division of the same conference with Harrell and McCoy. Thirty-eight touchdown passes in 330 attempts is extraordinary, and the Sooners are hotter on offense right now than anyone.

4. Tim Tebow -- Ever since that loss to Mississippi, Tebow has elevated his game back to 2007 levels. He has accounted for 22 touchdowns in six straight shellackings. If Florida keeps winning, it will be hard not to move him higher on the ballot.

5. Jeremy Maclin -- This spot could go to teammate Chase Daniel, but the quarterback has thrown 10 interceptions in his past six games after one in his first five. Or it could go to Texas Tech WR Michael Crabtree, who is very deserving. But Maclin leads the nation in all-purpose yards (200.4 per game) and can beat a team from anywhere on the field.

Each week, ESPN.com's panel of experts casts its votes for the top Heisman candidates. The panel consists of analysts, former players, former coaches and ESPN.com's college football staff.

Votes: 1st place = 5 points, 2nd place = 4, 3rd place = 3, 4th place = 2, 5th place = 1.

For the complete list of Heisman winners, click here.