Philadelphia Phillies
As much as people love to hate on the Phillies, and hate to love them; they are a pretty good ball team.  Talk about loyal, they are the only MLB team in their original city, as well as with the original name.  

Also the most losingest professional sports franchise with more than 10,000 losses.
"Did you hear the Philadelphia Phillies beat the Mets?"

"No, but when you build a team to beat them and forget a lot of the easier teams, that happens."