Possible Clues:

• Letters after Sen. Schumer's name
• Letters after Chuck Schumer's name
• Letters after Chuck Schumer or Kirsten Gillibrand
• Sen. Schumer's designation
• Letters after Sen. Kirsten Gillibrand's name
• Letters next to Clinton's name, until 2008
• Letters after Sen. Charles Schumer's name
• Abbr. that often appeared after "Moynihan"
• Letters after Hillary Clinton
• Abbr. after Hillary's name