It is currently the Tampa Bay Buccaneers, who lost 26 straight games before finally winning.
The Detroit Lions, Followed by an unexpected team, the Dallas Cowboys.
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The Tampa Bay Buccaneers still hold the longest losing streak record in the NFL. They went 0-26 in 1976 and 1977, there first two seasons in the league. The did manage 2 wins at the end of the 1977 season.
The New EnglandPatriots (as of 9/15/09) have won 12 straight against the Buffalo Bills. That is the longest losing streak currently The Buffalo Bills have beaten the Cincinnati Bengals 9 games straight. The Bengals have not beaten the Bills since 1989. That is the fourth longest streak as far as losses and the longest as far as time.
FAVRE
barry sanders did it for over 10 years.
washington
Indianapolis Colts
The losing streak was 26 games, starting with their first game in the NFL.
The Detroit Lions.
Pittsburgh steelers
THEE INDIANAPOLIS Colts