Possible Clues:

• The "A" of James A. Garfield
• Middle name of the 20th U.S. president
• . . . Birchard, __, Alan, . .
• Biblical name meaning 'exalted father'
• Hussein : Obama :: ___ : Garfield
• James A. Garfield's "A"
• First name of the first patriarch
• Delano : FDR :: __ : Garfield
• Biblical patriarch who had 'ha' added to his name when he was 99 years old
• Middle name of President Garfield