You may find this place to be a good resource: http://americanantiquarian.org/
The American Antiquarian Society (AAS) library houses the largest and most accessible collection of printed materials from first contact through 1876 in what is now the United States, the West Indies and parts of Canada.
From your source. Hadn’t realized there was a lot of action beyond just political. There were a lot of grass roots movement.
This article, published in De Bow’s Review in May of 1854 and written by the Lafayette Emigration Society, was a call to southerners to emigrate to the Kansas territory, particularly those who owned slaves or could vote. Just as northern groups, such as the New England Emigrant Aid Company, sought to send free-soil immigrants to the Kansas territory in order to establish numerical and moral superiority in the territories by importing, as it were, numerous people from Massachusetts and New England, their southern counterparts sought to bring in enough southerners, slaveholders, and slaves to firmly establish slavery in the territory.
De Bow’s Review was a periodical of “agricultural, commercial, and industrial progress and resources†established in New Orleans in 1846 by James D. B. De Bow (1820-1867). Its articles, largely written by De Bow himself, covered a range of topics including planting and agricultural reform, economics, and politics, all with a heavy emphasis on the South. From 1853 to 1857 he moved the headquarters of the periodical to Washington, D.C., where he was serving as superintendent of the U.S. Census. During this period, his sectionalist arguments in the Review became more fervent and frequent. By the outbreak of the Civil War, De Bow’s Review was the most widely circulated Southern periodical.
This particular article was published while the Kansas-Nebraska Act was still being debated in Congress, but was already anticipating the increasing tension that would result from the adoption of popular sovereignty. By bringing into Kansas as many southerners and slaveholders who could vote as possible, they hoped to have a solid southern population by the time of the fall elections.