BQ78 said:
His strategic objective given to him by Lincoln wasn't that ambitious but it should have been. He could have probably done it easily too if he had coordinated his attacks or even just used Porter's Corps and his cavalry after his disjointed attacks.
I think at this point Lincoln understood this as the AoP's proper objective, although he might not have communicated it explicitly. He was certainly (and rightfully) pissed at McClellan for his failure to pin the ANVa against the river and crush them. McClellan had an entire corps that didn't do any fighting the day before.
Lincoln and McClellan had very different appreciations of how to fight the war. McClellan envisioned a much 'softer', capture the enemy's capital, checkmate kind of war. I think Lincoln understood that it would take a lot more than that to break the South's will to continue fighting. (To borrow from a former boss of mine, "War is an armed contest of wills."
In the end, events proved Lincoln correct. Once Lee surrendered to Grant, Johnston and even Forrest followed shortly after.