Related Clues:

• Joe Biden and predecessors
• Many future presidents, as it turned out
• Company officers
• Substantives
• Bread and butter, for two
• Biden and Pence
• Gore ... and more
• Grammatical things
• High-level execs
• Adjective and adverb, for two
• Subjects in writing?
• They're grammatical
• Intelligence to grasp new words
• Sentence VIPs
• Parts of speech – proper, collective, verbal, etc