“...As head of his party, the president has enormous influence over
the disbursement of senatorial campaign funds to party members...”
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That does not explain the motivation of the opposition party.
>>That does not explain the motivation of the opposition party.
Two sentences later:
GOP senators also work in fear. They must gauge the effect a frenzy of hyped up media opposition could have on their reelection. In short, the senators of the party of the president are his tools, while the senators of the opposing party fear crossing the popular culture.