Miscellaneous Musing #51: He Couldn't Have Dun More to Free Slaves

It's been established that in 1862, the year of his "Emancipation Proclamation", President Lincoln still had disturbingly unenlightened attitudes toward Blacks.  This raises an intriguing question: Was the motivation for his proclamation any different from that for the one made four-score-and-seven years earlier, by Virginia's royal governor Lord Dunmore, viz., to recruit slaves as soldiers to help win a war of secession?