Partisanship often refers to bias in favor of one's own political party over others. His partisanship led him to dismiss all ideas from the opposing party.
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Negative Connotation
The term can imply unreasonable or blind loyalty that may ignore broader concerns or fairness. Voters are tired of the partisanship that's causing government gridlock.
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Not Always Negative
While often seen as negative, partisanship can also reflect a strong, passionate commitment. Her partisanship for environmental causes is well-respected.