In the United States, the Attorney General is the head of the Department of Justice and a member of the President's Cabinet. As head of the DOJ, he is in charge of a variety of agencies including the Federal Bureau of Investigation, the Drug Enforcement Administration, the Bureau of Prisons, and the Bureau of Alcohol, Tobacco and Firearms. The Attorney General also supervises the U.S. Attorneys located in cities throughout the country, who represent the United States in criminal and civil matters in courts other than the U.S. Supreme Court. Finally, as a senior Cabinet member, the Attorney General generally is one of the President's closest advisors.
The Solicitor General works under the Attorney General and is in charge of representing the United States in matters before the U.S. Supreme Court.
Each state has an attorney general (actual titles may vary), who in most instances is in charge of representing the state in civil matters. Representation of states in criminal matters is not centralized, but is handled by the prosecutorial officer in each county, generally known as the district attorney, state's attorney or people's attorney.
"Let me think about it" = the coward's way of saying "no"