1810 Prentiss Mellen, Federalist US Senator, early Abolitionist, 1st Maine Chief Justice, signed letter & postal cover to William Sullivan, Boston

1810 Prentiss Mellen, Federalist US Senator from Massachusetts, 1st Chief Justice of Maine following it's statehood in 1820, addressed to William Sullivan, Boston.  Cover postmarked Portland, ME, APR, addressed to William Sullivan, Counsellor at Law, Boston, docketed "P. Mellen, April 10, 1810 - Representative Election" as well as "Prentiss Mellen - Portland, 1810."   Contextual setting for letter:   Prentiss Mellen is writing in early April, 1810 in reaction to recent 1810 election results and specifically to the 1810 Massachusetts gubernatorial election that was held on April 2, 1810.  Incumbent Federalist Governor Christopher Gore was defeated by Democratic-Republican nominee Elbridge Gerry (signer of both the Declaration of Independence and the US Constitution).  After this letter in 1812, Elbridge Gerry signed the notorious bill that created a partisan district in the Boston area that was compared to the shape of a mythological salamander. known today as the practice of district m