YES, Marcus Allen did win a national champioship He was a freshman tailback behind All-American tailback Charles White on the 1978 USC National Championship team. The team was coached to the National Championship by head coach John Robinson. Thus, Marcus Allen has won the Heisman Trophy, a National Championship and the Super Bowl.
No they haven't one a national championship
Yes in 2008 with the Boston Celtics.
Yes, he played in Superbowl 18.
WVU played in the 1988 national championship against Notre Dame.
Alabama has never lost a national championship game.
Yes ... Troy won the NAIA national championship in 1968 and the NCAA Division II national championship in 1984 and 1987.
The Maine Bears have never won a National Championship in football.