Edward Channing, A Student’s History of the United States, 4th ed. (New York: MacMillan Co., 1922), 437-438.
The Republicans held their convention at Chicago in May, 1860, and adopted a studiously moderate platform. They denied any intention to interfere with slavery in the states, which in their opinion was a matter for the voters of each state to settle for themselves whenever and as often as they pleased. They demanded, however, that Congress should prohibit slavery in the territories—for them the Dred Scott decision had no validity. They also declared in favor of the protective system and internal improvements at the charge of the general government. The selection of a candidate for the presidency proved to of Lincoln, be difficult. Seward and Chase were the most prominent leaders in the party; but they had been "too conspicuous," and Seward was regarded as a visionary. Lincoln was comparatively unknown; he had few enemies, and was strong in the doubtful Western states which had been carried by the Democrats in 1856. His "availability," to use a modern political phrase, commended him to the delegates; but his nomination was hastened by the transfer to him of the votes of fifty delegates who were pledged to Cameron of Pennsylvania. This transfer was made in consequence of a promise given by Lincoln's friends that Cameron have a cabinet position; it should, however, be said that this was in opposition to Lincoln's express direction. His nomination was received with some indignation by the abolitionists.