Absolutely not so. At one point, it was his primary goal. But Lincoln realized from well before his inauguration that slavery was THE issue.\
Read the "Cooper Union Speech" that put Lincoln on the map as a serious candidate.
Of course slavery was "the" issue (despite claims of neo-confederates to the contrary) that was tearing the country apart. My point was that from the moment he was challenged with disunion, the Union was Lincoln's pole star, his one primary challenge as President.
Didnt he say somethin to the effect that if he had to keep slavery to preserve the union, he'd do it, and if he had to abolish slavery to preserve the union he'd do it. He clearly aw slavery as important but secondary.
Also, it was not the Republican platform nor Lincoln's intended political goal to abolish slavery outright:
http://members.aol.com/jfepperson/repub.html
Cooper Union - interesting speech but focussed on expansion of slavery into territories, not slavery in existing states...
http://members.aol.com/jfepperson/cooper.html