The Emancipation Proclamation did not free a single slave. Maryland, Delaware, and Kentucky were exempted and D.C. had already abolished slavery in 1861.Lincoln proposed no such thing when he was elected. The sole platform of the Republicans was preventing spread of Slavery into the territories. There was no official push for uncompensated emancipation before the South rebelled.
He definitely did so AFTER the Southern States asserted their Rights.
Emancipation was more of a political issue than moral.