Why does McClellan have such a reputation of being a general who Lincoln could not persuade to continue to press Lee after a battle and who he released from command twice.
Because historians are presented with the choice of blaming Lincoln or McClellan for the way the war did not end in 1862, and they choose McClellan to blame.
Why did McClellan receive such a bad reputation from Lincoln's administration as a Union Napoleon. and as a inepte general who would not risk what it took for victory as with Grant?
Because Lincoln did not understand warfare and thought he did. He thought it was just an easy thing of going straight towards the enemy and fighting them - he actually spoke approvingly of the slaughter at Fredericksburg!
Was there any politics involved in his evaluation by the administration?
Yep. McClellan was a War Democrat, and just after the November midterms there was a big purge of them.
Is it true that the reason his soldiers loved him is that he would not put them in any situation which may cause them a loss or a large death total.
His soldiers appear to have loved him because he wouldn't do that to them without good reason. McClellan was certainly willing to put his soldiers into nasty situations - he after all was the attacker at Antietam which saw the bloodiest day of American military history - but he wouldn't throw them against prepared defences without good reason.
If he had not been so hostile to Lincoln or egotistic would he had remained in command?.Did Lincoln know of his political leaning as to slavery and the war?
It's hard to say about the first one, but I suspect not. As for the second one, yes, Lincoln knew that McClellan's preferred solution was not to officially end slavery but instead to just forcibly purchase every slave in an entire state and free the lot.
He was always demanding more troops or ordinance when Lincoln would seem to think he had what he needed,or was that Halleck?
What kept happening - and this happens in April, May, June and July - is that McClellan is promised a certain number of troops by Lincoln, and Lincoln agrees that McClellan needs those troops, and then Lincoln or Halleck doesn't send the troops.
In September and October it's instead vital supplies.
Why has historians for so long written of Mc.as this metrotic general? Why has the military historian ,at least till recently. written him as this third rate general? Know of honest bios on Little Mc,?
The essential problem is that errors have polluted the historiography. There are four main sources of them:
The first set of sources is 1864 election propaganda. A lot of the usual falsehoods about McClellan come from this period, like the idea he was on a gunboat during the fighting at Malvern Hill (which is a conflation of two different
days - he was on a gunboat when the fighting
started at Glendale, the day before).
The second set of sources is the Lost Cause, which argued that every Union general had had massive advantages, Lee had been a wizard to beat everyone until Grant, and Grant had simply crushed him under massive numerical superiority. This involved distorting the numbers at all the battles, and while most of the distortions got caught it wasn't done for McClellan - so the Lost Cause numbers were allowed to stand, creating the false impression that McClellan's army was much bigger than it was.
(Walter H. Taylor, for example, calculated Lee's strength at Antietam by explicitly assuming that Lee got no reinforcements whatsoever after Second Bull Run - which ignores several entire
divisions for a start.)
The third set of sources is the group of authors who followed the concept of "Lincoln finds a general", which was the idea that the main problem the North had with winning the war was the psychology of the generals. This pretty much discarded the actual numbers in favour of arguing that only Grant had the willpower to actually
fight, an absurdity on the face of it when you consider that McClellan must therefore have somehow reached the outskirts of Richmond through the power of pacifism.
And the final set of sources is, basically, Stephen Sears. Sears is a popular historian, but he's not a good historian - he's been caught out on several occasions actually
inventing evidence, or lying about it, or distorting it, and usually in the service of making McClellan look bad.
The reason for the third and fourth set of errors appears to simply be that McClellan has become a caricature. People (for historians are people) have become
invested in the idea that he sucks.