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There were two rival Republican conventions in 1864. The first was by a group of radicals upset with Lincoln's position on the issues of slavery and post-war reconciliation with the southern states. They met in Cleveland, Ohio and nominated John C. Frémont for the Presidency on May 31, 1864, adopting the name Radical Democracy Party.
This 1864 frisson in the Republican Party divided the party into two factions: the anti-Lincoln Radical Republicans, who nominated Frémont, and the pro-Lincoln Republicans. Frémont abandoned his political campaign in September 1864, after he brokered a political deal in which Lincoln removed U.S. Postmaster General Montgomery Blair from office.
The 1864 National Union Convention was held in Baltimore, Maryland, from June 7 to June 8, 1864. It renominated the incumbent Abraham Lincoln for the presidency, and nominated War Democrat Military Governor Andrew Johnson of Tennessee for the vice presidency. The ticket was successful in the election of 1864.