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In page Campaign finance reform in the United States:

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In the campaign of 1872, a group of wealthy New York Democrats pledged $10,000 each to pay for the costs of promoting the election. On the Republican side, one Ulysses S. Grant supporter alone contributed one fourth of the total finances. One historian said that never before was a candidate under such a great obligation to men of wealth. Vote buying and voter coercion were common in this era. After more standardized ballots were introduced, these practices continued, applying methods such as requiring voters to use carbon paper to record their vote publicly in order to be paid.[citation needed]