Final answer:
During the 1860 Presidential election, Stephen A. Douglas, John C. Breckinridge, and John Bell were key Democratic Party nominees. The party faced internal divisions that led to the reconvening of the convention in Baltimore.
Explanation:
Stephen A. Douglas and John C. Breckinridge were the two main candidates nominated by the Democratic Party during the 1860 Presidential election after facing internal divisions. John Bell, representing the Constitutional Union Party, was another nominee in the same election. The failure to nominate a candidate in Charleston led to the reconvening of the convention in Baltimore, where the final nominations took place.
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