WASHINGTON - Senate GOP leaders plan to confirm Supreme Court nominee Samuel Alito early next week after dealing with a filibuster threat from Democratic die-hards who worry that the conservative judge would swing the court too far to the right.A final vote making the New Jersey jurist the nation’s 110th Supreme Court justice was scheduled for Tuesday morning, only hours before President Bush begins his State of the Union address to Congress and the nation, if Alito’s bipartisan supporters succeed in rounding up 60 votes to cut off debate on Monday.<SNIP>A Democratic senator who plans to vote against Alito’s confirmation,...