Aaron Rodgers threw for 250 yards and four touchdowns as the Packers remained undefeated with a 45-7 rout of the Vikings on "Monday Night Football."  Randall Cobb returned a punt 80 yards for a score just over a minute into the game for the 9-and-0 Packers, who are off to their best start since opening the 1962 season with 10 straight wins.  Jordy Nelson had five grabs for 63 yards and two touchdowns in the one-sided affair.  Christian Ponder was just 16-of-34 for 190 yards and an interception for Minnesota, which dropped to 2-and-7.  Adrian Peterson rushed for 51 yards and a touchdown in the lopsided loss.