The United States Supreme Court has declined to take up the hottest question about gun rights now dividing the nation's courts: is there a constitutional right to carry a gun outside the home? The justices today passed up a challenge brought by five residents of New York's Westchester County to a state law that forbids carrying a gun unless a person desiring to do so can show "proper cause" -- some special need for protection that goes beyond a general desire for self-defense. Those who can demonstrate that need can be granted a license to carry a firearm. The federal appeals courts are split on whether the Second Amendment provides a right to carry a gun in public.