What is the most limiting factor for the power of congressional party leaders?

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The coordination of fellow partisans is the most limiting factor for the power of congressional party leaders. While party leaders have significant control over the agenda and can direct party members on how to vote, they are ultimately limited by the willingness of their fellow partisans to follow their lead. If party members are not coordinated or do not support the party leadership, the power of the leader is greatly diminished. The size of the chamber, level of campaigning, number of committees, and number of parties in the electorate can all have an impact on the power of party leaders, but their ability to coordinate their fellow partisans is the most critical factor.

What Is the Most Limiting Factor for the Power of Congressional