Possible Clues:

• He swore in Hoover
• President that sat on the Supreme Court
• President from Ohio
• Mr. Republican
• Only man to be U.S. President and Chief Justice
• First president to occupy the Oval Office
• -- -Hartley Act
• President who frequently got stuck in the bathtub
• Wilson predecesssor
• U.S. President who inaugurated baseball's 7th inning stretch, allegedly