It may have started as a blue law but as livbucks and others have pointed out, there is probably a better reason now.
If so wouldn't that be a violation of church and state?
There is no church and state law in the constitution.
Besides, these are your peers who voted this down - not "The Man"
If you feel strongly about it, and who wouldn't, I'd start a petition and lobby to have the law changed - put it up for revote - get involved.