From Muppet Wiki

John Adams (1735-1826) was a lawyer and statesman who was among the founding fathers of the United States of America, and headed the committee which drafted the Declaration of Independence (although the writing was primarily the work of Thomas Jefferson). Adams served as the first Vice-President under George Washington and then as second President of the United States. He has also been commemorated as the protagonist of the musical 1776.

References

• In a Sesame Street "American Revolution" sketch, Ernie appeared as Adams (with Bert as Jefferson) to support the choice of the eagle as the national bird.
• Fozzie Bear played Adams in I Love Liberty, and is aghast at the serious and passionate dialogue he's assigned, which is "not funny."