Party leaders of the United States House of Representatives:

A party's floor leader, in conjunction with other party leaders, plays an influential role in the formulation of party policy and programs. He is instrumental in guiding legislation favored by his party through the House, or in resisting those programs of the other party that are considered undesirable by his own party. He is instrumental in devising and implementing his party's strategy on the floor with respect to promoting or opposing legislation. He is kept constantly informed as to the status of legislative business and as to the sentiment of his party respecting particular legislation under consideration. Such information is derived in part from the floor leader's contacts with his party's members serving on House committees, and with the members of the party's whip organization.

Please answer a question about this article. If the question is unanswerable, say "unanswerable". Who plays an influential role in the formation of party policy?
A party's floor leader