In US history, there have been instances of faithless electors voting against their pledged party candidates.
Faithless Electors: In the history of the USA, there have been instances of faithless electors who voted against their political party. For example, in the 2016 Trump/Clinton contest, there were 10 faithless elector votes. This demonstrates cases where electors did not cast their vote for the candidate they were pledged to support.
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