Are the American people ready for an elected president who was educated in a Madrassa as a young boy and has not been forthcoming about his Muslim heritage? This is the question Sen. Hillary Rodham Clinton’s camp is asking about Sen. Barack Obama. An investigation of Mr. Obama by political opponents within the Democratic Party has discovered that Mr. Obama was raised as a Muslim by his stepfather in Indonesia. Sources close to the background check, which has not yet been released, said Mr. Obama, 45, spent at least four years in a so-called Madrassa, or Muslim seminary, in Indonesia.