The schism in the Democratic Party over the Lecompton Constitution and Douglas' Freeport Doctrine caused Southern "Fire-Eaters" to oppose front runner Stephen A. Douglas' bid for the Democratic presidential nomination. Douglas defeated the pro-slavery Lecompton Constitution for Kansas because the majority of Kansans were antislavery, and Douglas' popular sovereignty doctrine would allow the majority to vote slavery up or down as they chose. Douglas' Freeport Doctrine alleged that the antislavery majority of Kansans could thwart the Dred Scott decision that allowed slavery by withholding legislation for a slave code and other laws needed to protect slavery. As a result, Southern extremists demanded a slave code for the territories, and used this issue to divide the northern and southern wings of the Democratic Party. Southerners left the party and in June nominated John C. Breckinridge, while Northern Democrats supported Douglas. As a result, the Southern planter class lost a considerable measure of sway in national politics. Because of the Democrats' division, the Republican nominee faced a divided opposition. Adding to Lincoln's advantage, ex-Whigs from the border states had earlier formed the Constitutional Union Party, nominating John C. Bell for president. Thus, party nominees waged regional campaigns. Douglas and Lincoln competed for Northern votes, while Bell, Douglas and Breckinridge competed for Southern votes.