Answer:
The debates made Lincoln famous nationwide.
Brought moral issue of slavery into sharp focus.
Explanation:
At that time, the state of Illinois used a lot of slaves labor to sustain its production, which eventually help Stephen Douglas (who supported slavery) won the senate race.
But, the northern states who did not used much of slave labors started to view Lincoln as a hero for his bravery in voicing up controversial opinion regarding immorality of owning the slaves. This made Lincoln very famous nationwide and eventually helped him won the presidential election.
