Somehow I doubt Stefanik is causal. Chair of the caucus (#4 leadership slot), and as opportunistic as they get.
As for the chalice, it puts you two heartbeats away from the presidency and is more or less the only way a House member can get into the history books, short of clandestine war (Charlie Wilson) or scandal. The House is a body where members other than the Speaker and committee chairs rarely wield real influence. DeLay is something of an anomaly, in that regard.
Senators, by contrast, can be true power brokers without a leadership slot. Ted Kennedy spent two years as majority whip, McCain never was in leadership, and if you wanted something from the other side they were where you went, because they knew their own side well enough to tell you how to get to 60 votes.