sentences:  It also endorsed a protective tariff, internal improvements such as a transcontinental railroad, and policies designed to encourage the settlement of public land in the West.The 1860 Democratic National Convention met in April 1860, but adjourned after failing to agree on a candidate.A second convention met in June and nominated Stephen Douglas as the presidential nominee, but several pro-slavery Southern delegations refused to support Douglas, as they demanded a strongly pro-slavery nominee.