Copyreader, e.g

• Revisionist
• One proposing a rider to a bill
• Editor, in a way
• One who tacks riders on bills
• One changing a bill
• Copyreader, e.g.
• Constitution modifier, e.g
• Bill of Rights writer, e.g.
• One improving in the morning, one coming last

Wiktionary Word definitions in Wiktionary
n. One who amends.