Chester A. Arthur where the former Senator hoped for a quick re-election to the Senate, and with it, a defeat for the Garfield administration. The Republican majority in the state legislature was divided on the question, to Conkling and Platt's surprise, and an intense campaign in the state house ensued. While in Albany on July 2, Arthur learned that Garfield had been shot. The assassin, Charles J. Guiteau, was a deranged office-seeker who believed that Garfield's successor would appoint him to a patronage job. He proclaimed to onlookers: "I am a Stalwart, and Arthur will be President!" Guiteau was found to be mentally
Charles J. Guiteau storage by the museum. Parts of Guiteau's brain remain on display in a jar at the Mütter Museum in Philadelphia. Dr. Allan McLane Hamilton said in 1881 that he believed that Guiteau was sane when he assassinated Garfield. An autopsy of Guiteau's brain revealed that his dura mater was abnormally thick, suggesting he may have had neurosyphillis, a disease which causes mental instability; he could have contracted the disease from a prostitute. George Paulson, formerly the chair of neurology at Ohio State University, disputed the neurosyphillis diagnosis, arguing that Guiteau suffered from both schizophrenia and "grandiose narcissism". In 2014, the