Lincoln was opposed to slavery, as stated in the first few sentences of this article:
https://en.wikipedia.org/wiki/Abraham_Lincoln_and_slavery
You've committed one of the carnal sins of quotation, namely taking the quoted material out of context.
https://en.wikipedia.org/wiki/Quoting_out_of_context
Lincoln's quote in its entirety reads, "If I could save the Union without freeing any slave, I would do it; and if I could save it by freeing all the slaves, I would do it; and if I could save it by freeing some and leaving others alone, I would also do that... I intend no modification of my oft-expressed personal wish that all men everywhere could be free."
http://www.history.com/this-day-in-history/lincoln-replies-to-horace-greeley
Liberals. Lying is in your nature. It worked for your presidential nominee, so why wouldn't it work for you!?