Without being too extravagant you can get by with 5000 to 10000 yen per day on lunch and dinner including transportation/subway/rail. That's about $50.00 to $100.00 in American dollars (minimizing taxi usage). Try to avoid the taxi's because that could cost a small fortune, especially in rush hour.
The popular referendum is a device which allows voters to approve or repeal an act of the Legislature. If the Legislature passes a law that voters do not approve of, they may gather signatures to demand a popular vote on the law.
The U.S. Constitution gives states and municipalities the right to decide who is eligible to vote. Non-citizen voting rights, however, were largely repealed due to the anti-immigrant sentiment of the late 19th and early 20th centuries. In the Civil War era, Southern states resented immigrants' opposition to slavery.