Which two presindential candidates in 1860 took directly opposing positions on slavery in the western territories?

In the 1860 presidential election, Abraham Lincoln, the candidate of the Republican Party, opposed the expansion of slavery into the western territories, advocating for free soil policies. Conversely, Stephen A. Douglas, representing the Northern Democrats, supported the principle of popular sovereignty, allowing settlers in the territories to decide for themselves whether to permit slavery. Their opposing views on this critical issue highlighted the deep divisions in the nation leading up to the Civil War.