his doctrine of "popular sovereignty," 107;
avoids consequences of Dred Scott decision, 107;
defies Buchanan, 108;
his conduct in Lecompton case dictated by desire to secure reëlection to Senate, 108;
attacks "English Bill" as unfair, 109;
his candidacy for reëlection gives Lincoln opportunity, 113;
renominated by Democrats, 114;
denounced by South, 116;
opposed by administration, 116;
accepts Lincoln's challenge to joint debates, 121;