How about a....
Political RP
It is based around a semi-modern government. Everyone forms a Character, who can make a party, join a party or run for office. They must play for votes, with Propoganda, evocative language and sound policies. Each Party will appeal to certain people in The People's Republic of Gamingstevia, for example: Old People, Working Class, The Military. Those who had majority control of the Military could emply a coup de'tat against the ruler. Parties, Or Rebel Groups, could form co-alitions, and various parts of each party could attempt to gain control.
Have fun fleshing that out.