I think Lincoln is probably one of the worst presidents we've ever had; the way people idolize him never ceases to surprise me.
Lincoln did not consider African Americans the equal of the white man. It is not even known if he supported African-American freedom. Lincoln was the ultimate Machiavellian president. He spent his early life as a whig, until the very end of that party when it was replaced by the republican party. The main supporters of the republicans were the abolitionists, and any Republican candidate who was pro-slavery in that election would not have won the nomination. It wasn't until about six months before that nomination process started that Lincoln began speaking out against slavery. he went with the politically expedient position.
The Civil War was in large part his fault; he forced the confederated hand by supplying the fort (its name slips my mind) in the way and time that he did. Lincoln was a politician, and a great one, but not the man of morals and ethics that people make him out to be.