Stephen A. Douglas was a strong supporter of the "manifest destiny" idea. Unlike Lincoln, he supported the Mexican-American War. He envisioned a transcontinental railroad and wanted western territories to become states. He wanted the United States to stretch from sea to sea. He was a very strong supporter of the Union and urged Democrats to support the war effort. He went to see Lincoln when Lincoln arrived in Washington DC. The men had a long private interview. He wore himself out traveling and speaking on behalf of saving the Union.