John Hancock

On May 24, 1775, John Hancock was unanimously elected President of the Continental Congress. From the article:

"Hancock's popularity guaranteed him election to every political post he sought, and in 1774 he was chosen as a member of the Massachusetts delegation to the First Continental Congress. In 1775 he returned as a member of the Second Continental Congress which elected him President. He presided over the chamber during the discussion concerning the appointment of a commander in chief for the Continental Army. It is likely that he saw himself as a candidate for the post and was deeply disappointed when both John Adams and Samuel Adams rose to nominate George Washington. Hancock remained president during the debate over independence and famously signed the Declaration with his bold signature.

Hancock returned to Boston in 1777, and in 1780 he was elected first governor of the Commonwealth of Massachusetts.
As a politician eager to defend the rights and powers of his state, Hancock was unsure about the Federal Constitution. Although he presided over the state ratifying convention he and Samuel Adams, who held similar views, remained silent during the debates. When it became clear, however, that ratification might fail, the two "Old Revolutionaries" spoke in support of the Constitution and it was approved by a narrow margin (187 to 168). Legend suggests that some suggested to Hancock that while Washington most certainly would become President it was likely a New Englander would be selected as Vice President and that he was a logical choice."