Declaration of Independence signer Caesar Rodney is best known for his horseback ride through thunder and rain, along dirt roads and across water swollen creeks to break the tie in the Delaware delegation to the Continental Congress. He arrived in Philadelphia on the afternoon of July 4, muddy and with his spurs on, just in time to cast the vote that ultimately led to independence. Rodney’s letter recounting that episode was sold at auction for $440,000 in 1989 to Albert H. Small. He later donated the letter along with a collection of other important Declaration of Independence doc...