He played college football for the Wisconsin Badgers, and was selected by the Houston Texans in the fourth round of the 2006 NFL draft.

[2] As a starting quarterback on the football team, Daniels led Naperville Central to an undefeated IHSA Class 6A State Championship in 1999.

[3] He earned Prep Football Report and PrepStar All-American honors and was named a Top 100 prospect nationally by PFR.

[citation needed] He completed 30 of 35 passes for 562 yards and seven touchdowns in the opening two games of his senior year before a knee injury ended his season.

[4] Daniels attended the University of Wisconsin–Madison and played for the Wisconsin Badgers football team under coach Barry Alvarez.

[7] Early in his college career, he was a back-up quarterback and played special teams, flanker, split end, and wingback.

[12] He earned the nickname "The Weatherman" as he majored in meteorology and appeared on the Madison area news delivering the local forecast.

[19] On December 7, 2008, he and quarterback Matt Schaub combined for a 27-yard completion during a game-winning drive to defeat the Green Bay Packers in Week 14.

[25] On November 1, 2009, in a game against the Buffalo Bills, Daniels tore his ACL and was placed on season ending injured reserve.

[40][41] Daniels agreed on a one-year contract worth $1 million with the Baltimore Ravens and joined head coach John Harbaugh on April 3, 2014.

[42] Following a season ending injury to starter Dennis Pitta, Daniels took over the starting role and amassed 48 receptions for 527 yards and four touchdowns.

[43] On March 10, 2015, Daniels signed a three-year, $12 million contract with the Denver Broncos and joined head coach Gary Kubiak.

[49] In the victory over the Patriots, Daniels caught the last touchdown pass that quarterback Peyton Manning ever threw in the NFL.