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By Lawrence Hurley WASHINGTON (Reuters) - A day before the U.S. Supreme Court hears landmark arguments on whether the Constitution provides a right to same-sex marriage, activists on both sides of the contentious social issue converged on the white marble courthouse to voice their views. Anti-gay rights activists rallied in front of the courthouse steps condemning same-sex marriage, while a line snaked around the block of people, many displaying gay rights messages, hoping to snag one of the limited number of seats available in the courtroom for Tuesday's 2-1/2 hour oral arguments. The nine justices will be hearing arguments concerning gay marriage restrictions imposed in Kentucky, Michigan, Ohio and Tennessee, four of the 13 states that still outlaw such marriages. The ruling, due by the end of June, will determine whether same-sex marriage will be legal nationwide.