The summer and fall of 1864 were marked by Lincoln's second Presidential campaign, he, and Andrew Johnson, of Tennessee, for Vice-President, having been nominated at Baltimore on the 8th of June. Frémont, who had been placed in the field by a convention of malcontents at Cleveland, Ohio, had withdrawn in September, and the contest was left to Lincoln and General George B. McClellan, the nominee of the Democratic convention at Chicago. The canvass was a heated and bitter one. Dissatisfied elements appeared everywhere. The Judge Advocate-General of the army (Holt) created a sensation by the publication of a report giving conclusive proof of the existence of an organized secret association at the North, controlled by prominent men in the Democratic party, whose objects were the overthrow by revolution of the administration in the interest of the rebellion.* * "Mr. Lincoln was advised, and I also so advised him, that the various military trials in the Northern and Border States, where the courts were free and untrammelled, were unconstitutional and wrong; that they would not and ought not to be sustained by the Supreme Court; that such proceedings were dangerous to liberty. He said he was opposed to hanging; that he did not like to kill his fellow- man; that if the world had no butchers but himself it would go bloodless. When Joseph E. McDonald went to Lincoln about these military trials and asked him not to execute the men who had been convicted by the military commission in Indiana he answered that he would not hang them, but added, 'I'll keep them in prison awhile to keep them from killing the Government.' I am fully satisfied therefore that Lincoln was opposed to these military commissions, especially in the Northern States, where everything was open and free."--David Davis, statement, September 10, 1866, to W. H. H.