The Republican Party nominated Abraham Lincoln as their candidate due to:
Abraham Lincoln was against slavery and the Republican party had been largely formed for this reason. There was therefore an alignment of goals between Lincoln and the party.
Abraham Lincoln had also been rising in popularity since he ran against Stephen Douglas for the Senate due to his very well articulated arguments which drew the attention and support of many. The party sought to capitalize on this popularity.
In conclusion, Lincoln's views and popularity led to him being nominated for President.
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