1904–05 United States Senate elections
Senators were elected over a wide range of time throughout 1904 and 1905, and a seat may have been filled months late or remained vacant due to legislative deadlock.Party share of seats remained roughly the same, when including vacancies and appointments, and the Republicans retained a significant majority over the Democrats.The party’s strong performance in the Senate mirrored President Theodore Roosevelt's landslide victory in the 1904 presidential election.This continuity of Republican control in both the executive and legislative branches contributed to the implementation of Roosevelt's progressive policies, such as trust-busting and railroad regulation, further cementing the party's influence during the early 20th century.Isidor Rayner defeated incumbent Louis E. McComas by a margin of 40.98%, or 50 votes for the Class 1 seat.Black was supported by Governor Benjamin B. Odell Jr., but after intense fighting behind the scenes, Odell finally dropped Black and accepted Depew's re-election which had been supported by his fellow Senator Thomas C. Platt and Speaker S. Frederick Nixon.