Washington would have considerable support if he had moved to abolish slavery. Although difficult it wasn't an impossibility. Besides the moral argument he had the military one.... The slaves were escaping and enlisting with the British.
No he would not have. If one reads (if you feel like it)
Founding Brothers one finds that the "Quaker Petitions"---two different petitions arriving on two different days from mostly Quaker citizens of the United States, particularly in Pennsylvania---were treated with contempt, even by northern congressmen, when received by the Senate and House of Representatives during the 1st Congress. The first was easily dealt with by "assigning it to committee for further study" (e.g., kill it). The second petition was NOT so easily killed...because it was countersigned by Ben Franklin, one of the "gods" in the "American Revolutionary Pantheon" second only to Washington himself (as Ellis puts it). Basically, these petitions call for an end to the slave trade, which the constitution of 1787 clearly states, cannot be altered or abolished before the year 1808. In other words, the international slave trade was protected for exactly two decades (though a tax of no greater than $10 per slave, probably a shitload of money back then, could be levied on it at any time). This was a necessary "compromise" between northern states, where slavery was dying, and southern states, where it either wasn't, or was in the very least taking its dear, sweet time to do so. The petition with Franklin's signature on it caused absolute uproar and damn near split the congress at the exact moment Americans would not have wanted it to.
That should tell you right there that No, Washington would not have had support enough to do it. Even to try it would have been a fool's errand, and any talk of it whatsoever above the level of a not-so-serious whisper would have destroyed the nascent Republic right then and there. I hate to make excuses for what is immoral, but it's true.
Funny enough, the Great Awakening didn't quite catch on everywhere. It was present in the southern states, but gee what do ya know, not as popular as it was in the North. And the traveling preachers probably had to hedge their language a little bit in the south.
Look at a map of the early United States, or the 1790 census, and you will see why. And not only is George Washington FROM Virginia, it just so happens to be the state with the largest number of Congressmen (10) and therefore electoral votes (12). Vermont I think got one congressmen when it was admitted to the Union in 1790
Some slaves did enlist in the Continental Army, thinking they'd get their freedom for serving (though I'm sure in most cases, the phrase "April Fools!" comes to mind).
And if all these slaves are escaping, well, don't you think their masters would have been terribly happy, especially in states where slaves were more integrated into the economy (cash crops: tobacco, cotton, etc.). Believe me, from where you're sitting it looks simple, because cotton cannot grow in Canada. One wonders when Parliament (British) would have finally outlawed slavery had the thirteen American colonies not been lost. Maybe the same time we ended up outlawing it? Likely. But that's another can of worms...and I seem to have lost my can opener.
I cannot give you perfect evidence I admit. But look at what's in the constitution: they demanded to count 3/5 of their slaves, 20 year prohibition on Congress outlawing the external slave trade, governors having the power to issue warrants to seize escaped slaves and return them to their "rightful owners", and basically leaving the rest up to state law. One quite read-through of the US constitution during Washington's presidency (meaning, only the 11 amendments at the time) should give you an idea that if these compromises had not been reached, there's no way in hell he could have done it without southerners and at least some northern congressmen joining hands to move for his impeachment.
Oh yeah, and the actual fact that it took four years of internecine warfare, costing a mind-boggling amount of American lives, in order to force its abolition on the 11 wayward states (not to mention, Lincoln himself had a pretty hard time selling it to the remaining states' members of Congress) should tell you something. Watch the movie Lincoln and you'll see what I mean.
You can quote any source you want, but taking the Constitution's language as well as the very fact of the American Civil War and its political aftermath and what's that add up to? Certainly not a smash and grab job to end slavery in the 1790's, even if it was George Washington.
But let's debate leaders not slavery PLEASE. Though I think your position of using it as argument for why Washington wasn't a "good" ruler is untrue, but still a fairly valid point I suppose (in other words, a nice enough argument in that it alleges truth, but the evidence is against it almost totally).
Millard Fillmore?
No just kidding.
John Adams wasn't bad. But I think Jefferson, for all his good qualities and deeds, deserves at least some censure for a measure of hypocrisy in some cases.
But what about Mikhail Gorbachev? Or Sadat? or Nasser? (or King Farouk if you want to bring out the baddies.)