"The politician earlier associated with the student communist movement lost his reputation with some in his party, who feared his history would hurt his chances of being elected."
A politician's reputation is either lost or regained and improved, depending on the prevailing circumstances and the movements that the politician is involved in. The loss of reputation leads to voter rejection and loss of electoral capital.
To be involved in the student communist movement in a democracy attracts the opprobrium of the majority.
Thus, the backlash for such communist involvement may result in McCarthyism.
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