Possible Clues:

• Still vying
• JFK part: Abbr
• Part of RBG or LBJ: Abbr
• Monogram letter: Abbr
• ''There's no future __''
• The G, W or B in G.W.B.
• W., e.g.: Abbr.
• Letterhead?: Abbr.
• Sign off on: Abbr.
• Embroidered ltr., often