What presidential candidate in 1860 wanted to avoid all controversy over slavery?

Abraham Lincoln wanted to avoid controversy about slavery even though he wanted to abolish it. He said he wouldn't change anything about slavery so that he would get supporters. After he was elected President of the United States he kept that promise until the Civil War started and he had to make it about slavery so that people would see why he was using so much energy and money on a war. 
Hope this helps! Please let me know if I missed something :) 

The case was a u.s. supreme court decision that defined the scope of the u.s. congress's legislative power and how it relates to the powers of american state legislatures. the dispute in mcculloch involved the legality of the national bank and a tax that the state of maryland imposed on it.