sought to impeach, therefore by means of similarity Lincoln, the first to be assassinated, and Johnson, the first whom it was sought to impeach, are linked together in our memory. Garfield and McKinley are the other two members of the second group, and they were killed in like manner as Lincoln, by pistol bullet. Arthur, like Johnson, Fillmore, and Taylor, was refused a nomination for the presidency, while Theodore Roosevelt was nominated and elected, being the only vice-president of the United States to be elected president after succeeding to the presidency on the death of the president. The one way to remember the vice-presidents who became presidents on account of the death of their predecessors while in office is by way of the grouping, and the other incidents are merely mentioned as aids to the principal means.
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