A new ABC News/Washington Post poll reveals that more than eight in 10 Americans (81%) support efforts to make marijuana legal for medical use, up from 69 percent in 1997. Fifty-six percent say that if it's allowed, “doctors should be able to prescribe medical marijuana to anyone they think it can help.” Last week the New Jersey state legislature passed a medical marijuana bill and yesterday Gov. Corzine signed the bill into law, making New Jersey the 14th state to provide its sick and dying patients…