Emotionally charged stories are remembered better than neutral stories. So basically you remember fun story's and not boring story's.
a) voter fraud and intimidation
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The answer is:
Harrison's wife was gravely ill and out of respect Grover Cleveland chose to also not run.
During The United States presidential election of 1892, former Democratic president Grover Cleveland beat president Benjamin Harrison, whose wife Caroline Harrison died of tuberculosis. As a consequence of the First Lady's decease in the course of the campaign, both candidates put an end to their political operations.