Possible Clues:

• U2 song paying tribute to an American icon
• ___ Day (third Mon. in January)
• Honoree of a D.C. monument at 1964 Independence Ave
• Jan. b'day honoree
• Jan. honoree's monogram
• D.C. memorial honoree
• Freedom Marcher's monogram
• January holiday inits.
• Annual honoree's inits.
• National b'day honoree