This article relies largely or entirely upon a single source
. (December 2015)
The Republican conference of the United States Senate chooses a conference chairperson. The office was created in the mid-19th century with the founding of the Republican party. The office of "party floor leader" was not created until 1925, and for twenty years, the Senate's Republican conference chairman was also the floor leader.
In recent years, the conference chair has come to be regarded as the third-ranking Republican in the Senate, behind the floor leader and whip. According to Congressional Quarterly, "The conference chairman manages the private meetings to elect floor leaders, handles distribution of committee assignments and helps set legislative priorities. The modern version drives the conference’s message, with broadcast studios for television and radio." 
List of Republican Conference Chairmen and Chairwomen in the United States Senate