Mr. Toombs made a most elaborate speech against this bill in July, 1846. If his Oregon speech had shown thorough familiarity with the force and effect of treaties and the laws of nations, his tariff speech proved him a student of fiscal matters and a master of finance. His genius, as Jefferson Davis afterward remarked, lay decidedly in this direction. Mr. Toombs announced in his tariff speech that the best of laws, especially tax laws, were but approximations of human justice. He entered into an elaborate argument to controvert the idea that low tariff meant increased revenue. The history of such legislation, he contended, had been that the highest tariff had raised the most money. Mr. Toombs combated the _ad valorem_ principle of levying duty upon imports. Mr. Toombs declared to his constituents in September, 1846, that the President had marched his army into Mexico without authority of law. "The conquest and dismemberment of Mexico, however brilliant may be the success of our arms," said he, "will not redound to the glory of our republic." The Whigs approached the Presidential campaign of 1848 with every chance of success. They still hoped that the Sage of Ashland might be the nominee. George W. Crawford, ex-Governor of Georgia, and afterward member of the Taylor Cabinet, perceiving that the drift in the West was against Mr. Clay, offered a resolution in the Whig convention that "whatever may have been our personal preferences, we feel that in yielding them at the present time, we are only pursuing Mr. Clay's own illustrious example." Mr. Toombs stated to his constituents that Clay could not be nominated because Ohio had declared that no man who had opposed the Wilmot Proviso could get the vote of that State. The Whigs, who had opposed the Mexican war, now reaped its benefits by nominating one of its heroes to the Presidency, and Zachary Taylor of Louisiana became at once a popular candidate. Millard Fillmore of New York was named for vice president, and "Rough and Ready" clubs were soon organized in every part of Georgia. The venerable William H. Crawford headed the Whig electoral ticket in Georgia, while Toombs, Stephens, and Thomas W. Thomas led the campaign. The issue of the campaign in Georgia was the Clayton compromise which the Georgia senators had sustained, but which Stephens and Toombs had defeated in the House. This compromise proposed that all questions concerning slavery in the governments of the ceded territory be referred to the Supreme Court of the United States. Mr. Toombs declared that the Mexican law prohibiting slavery was still valid and would so remain; that Congress and not the courts must change this law.