was Taylor's de facto campaign manager. Clay had initially told his allies that he would not run in the 1848 presidential election, but he was unwilling to support Taylor, a "mere military man." On April 10, 1848, he announced his candidacy for the Whig nomination. Although Webster and Winfield Scott each commanded a limited base of support in the party, Taylor and Clay each saw the other as their lone serious rival for the Whig nomination. As Taylor commanded the support of most Southern Whigs, Clay focused his efforts on courting Northern Whigs, emphasizing his opposition to the Mexican–American War and his life-long support for the gradual emancipation of slaves in Kentucky. Clay presented a strong challenge to Taylor at the 1848 Whig National Convention, but Taylor won the presidential nomination on the fourth ballot. Partially in an attempt to please the Clay wing of the party, the convention nominated Millard Fillmore as Taylor's running mate. Clay was embittered by his failure at the convention, and he did not campaign on behalf of Taylor. Nonetheless, Taylor won the election, taking 47.3 percent of the popular vote and 163 of 290 electoral votes. Taylor and Fillmore administrations, 1849–1852 Increasingly worried about the sectional tensions arising over the issue of slavery in newly acquired territories, Clay accepted election to the Senate in 1849. Having refused to campaign for Taylor, Clay played little role in the formation of Taylor's Cabinet or in determining the new administration's policies. In January 1850, with Congress still deadlocked regarding the status of the Mexican Cession, Clay proposed a compromise designed to organize territory acquired in the Mexican–American War and address other issues contributing to sectional tensions. His legislative package included the admission of California as a free state, the cession by Texas of some of its northern and western territorial claims in return for debt relief, the establishment of New Mexico and Utah territories, a ban on the importation of slaves into the District of Columbia for sale, and a more stringent fugitive slave law. Though it faced opposition from Southern extremists like Calhoun and Northern abolitionists like William Seward, Clay's proposal won the backing of many Southern and Northern leaders. President Taylor, who favored the immediate admission of California and New Mexico as free states without any attached conditions, opposed the plan, and Clay openly broke with the president in May 1850. Debate over Clay's proposal