The correct answer is "Stephen Douglass."
In the famous Lincoln-Douglas debates of 1858, the position described below was from Stephen Douglas.
When Abraham Lincoln was competing for the Senate of the state of Illinois in 1858, he had a tough adversary, Democrat Stephen Douglass. These two candidates performed seven debates that are considered by scholars as one of the most interesting and deep for the type of arguments they debated. The most important issues of the debates were the issue of slavery in the country and the states' rights.