Possible Clues:

• Mark who created Tom Sawyer
• Who wrote 'When in doubt, tell the truth'
• He wrote about Sawyer
• Clemens' pen name
• Shania --, Canadian country singer/songwriter
• Our Valentine song singer
• He said, "Man is the only animal that blushes. Or needs to"
• "The Prince and the Pauper" author
• Shania _____ (Juno Artist of 2003)
• Farm transport on time for Clemens