Much evidence shows that party unity has been increasing in Congress of late. Why is this so? Why do members of the same party vote together in the first place? Under what conditions are legislators likely to defect from their party?

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The Answer of Much evidence shows that party unity has been increasing in Congress of late. Why is this so? Why do members of the same party vote together in the first place? Under what conditions are legislators likely to defect from their party?

Much Evidence Shows That Party Unity Has Been Increasing in Congress