Oakland raiders
The Lions
Chicago bears From 1933, when the first NFL championship game was played, to 2008, when Super Bowl XLII was played, the team that has lost the most NFL championship games is the New York Giants who have lost 11 NFL championship games (pre Super Bowl) and 1 Super Bowl for a total of 12.
Winning 8 straight games will do it.
ATL son . that's straight
denver broncos
As of the start of the 2008 season, the Arizona Cardinals are the only franchise in the NFL to have lost 600+ games.
Detroit Lions
The St. Louis Rams with 15 losses.
Steeles
A '500 team' is a team that has won the same number of games as they have lost. The '500' refers to the team's winning percentage.
Pittsburgh steelers