Possible Clues:

• Dick Cheney, e.g.
• Prez's next-in-line
• White House colloquialism
• Second in command, often
• POTUS backup
• Joe Biden, e.g.
• 82 Across stand-in
• Gore, say, displayed in clips from very excruciating exploitative picture
• Resident of D.C.'s Observatory Circle
• Political satire starring Julia Louis-Dreyfus