One reason why partisanship in Congress has increased is that partisanship has increased, especially among party activists and committed party voters.

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Partisanship among party activists and committed party voters has indeed increased, and this has contributed to increased partisanship in Congress. As party activists and committed party voters become more ideologically polarized and demand more ideological purity from their representatives, members of Congress have become more likely to vote along party lines and refuse to compromise with the other party. This trend has been particularly pronounced in recent years, as polarization has reached historic levels.

One Reason Why Partisanship in Congress Has Increased Is That