When Lincoln first entered politics, Andrew Jackson was president. Lincoln shared the sympathies that the Jacksonians professed for the common man, but he disagreed with the Jacksonian view that the government should be divorced from economic enterprise. “The legitimate object of government,” he was later to say, “is to do for a community of people whatever they need to have done, but cannot do at all, or cannot do so well, for themselves, in their separate and individual capacities.” Among the prominent politicians of his time, he most admired Henry Clay and Daniel Webster. Clay and Webster advocated using the powers of the federal government to encourage business and develop the country’s resources by means of a national bank, a protective tariff, and a program of internal improvements for facilitating transportation. In Lincoln’s view, Illinois and the West as a whole desperately needed such aid for economic development. From the outset, he associated himself with the party of Clay and Webster, the Whigs.

As a Whig member of the Illinois State Legislature, to which he was elected four times from 1834 to 1840, Lincoln devoted himself to a grandiose project for constructing with state funds a network of railroads, highways, and canals. Whigs and Democrats joined in passing an omnibus bill for these undertakings, but the panic of 1837 and the ensuing business depression brought about the abandonment of most of them. While in the legislature he demonstrated that, though opposed to slavery, he was no abolitionist. In 1837, in response to the mob murder of Elijah Lovejoy, an antislavery newspaperman of Alton, the legislature introduced resolutions condemning abolitionist societies and defending slavery in the Southern states as “sacred” by virtue of the federal Constitution. Lincoln refused to vote for the resolutions. Together with a fellow member, he drew up a protest that declared, on the one hand, that slavery was “founded on both injustice and bad policy” and, on the other, that “the promulgation of abolition doctrines tends rather to increase than to abate its evils.”

During his single term in Congress (1847–49), Lincoln, as the lone Whig from Illinois, gave little attention to legislative matters. He proposed a bill for the gradual and compensated emancipation of enslaved people in the District of Columbia, but, because it was to take effect only with the approval of the “free white citizens” of the district, it displeased abolitionists as well as slaveholders and never was seriously considered.

Lincoln devoted much of his time to presidential politics—to unmaking one president, a Democrat, and making another, a Whig. He found an issue and a candidate in the Mexican War. With his “spot resolutions,” he challenged the statement of President James K. Polk that Mexico had started the war by shedding American blood upon American soil. Along with other members of his party, Lincoln voted to condemn Polk and the war while also voting for supplies to carry it on. At the same time, he labored for the nomination and election of the war hero Zachary Taylor. After Taylor’s success at the polls, Lincoln expected to be named commissioner of the general land office as a reward for his campaign services, and he was bitterly disappointed when he failed to get the job. His criticisms of the war, meanwhile, had not been popular among the voters in his own congressional district. At the age of 40, frustrated in politics, he seemed to be at the end of his public career.