The Lincoln-Douglas Debates in 1858 became important to the 1860 Presidential elections.
The set of debates that became important to the 1860 Presidential elections were the Lincoln-Douglas Debates.
The correct answer is the "Lincoln-Douglas Debates." To arrive at this answer, one can use a variety of methods, including conducting a search on the internet or consulting relevant historical sources. These debates are a series of seven debates that occurred between Abraham Lincoln and Stephen A. Douglas, both vying for the position of US Senator from Illinois in 1858. Although these debates did not directly impact the 1860 Presidential elections, they significantly influenced Lincoln's national reputation and played a role in shaping public opinion on slavery.
