In the Illinois Senate race of 1858 an opponent of slavery would have been MOST likely to vote for?

In the Illinois Senate race of 1858, an opponent of slavery would have been most likely to vote for Abraham Lincoln, the Republican candidate. Lincoln's platform was firmly against the expansion of slavery into new territories, aligning with the abolitionist sentiments of many voters at the time. His opponent, Stephen A. Douglas, supported popular sovereignty, which allowed territories to decide the slavery issue for themselves, making him less favorable to those opposed to slavery.