Lee's letter pointed out what Virgina thought of Secession in 1812
To be sure, the meeting at Hartford put an end to the already waning national fortunes of the Federalist Party while giving a legitimacy to the notion of nullification which would haunt the nation later.... That faith, however, could have many consequences and take many forms. It was the dark legacy of the Hartford Convention not only to taint ineradicably the Federalist Party with disloyalty and irrelevance, from which it died in 1820, http://earlyamerica.com/review/winter2000/federalist.html
No. If YOU make an unsupported claim, it's up to you to provide documentation. In this case I've seen the secondhand evidence, what I want is primary evidence that the states considered secession treason, and the secondhand account of one federal representative is not overwhelming proof of your position.
If you wish to continue your position that a single, unsubstantiated account validates your position, then I readily adopt it to prove that secession was legal.
No. Secondly, Lee's letter documented that the fortunes of the Federalist Party were already oon the wane - I listed several reasons previously.