Which product did Abraham Lincoln unexpectedly endorse before becoming president, making him the only president to hold a patent for a commercial product?

Before celebrity endorsements became commonplace, some famous historical figures lent their names to products in surprising ways. This poll explores one of the most unexpected product endorsements from American history that connects a famous president to a commercial product. Test your knowledge about this fascinating intersection of American leadership and early product marketing.

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

A method for lifting boats over shoals and obstacles in rivers
A specialized printing press for campaign materials
A unique design for men's formal hats
A legal documentation system for railroad companies