Michigan (not sure)
Michigan allows charity raffles. Please the following for more info:
Mich. Comp. Laws § 432.101 et seq Charitable Gaming Division of Michigan lottery.
http://michigan.gov/documents/BSL-CG-1824_26045_7.pdf
Potential Issues to be aware of:
Lotto or lottery cannot be used in advertising of a raffle or on the raffle tickets.
Physical tickets must be used in a the drawing. License info must be printed on tickets.