Wendy J. Schiller (Brown University) & Charles Stewart III (Massachusetts Institute of Technology). Electing the Senate: Indirect Democracy before the Seventeenth Amendment (Princeton University Press, 2014).
"From 1789 to 1913, U.S. senators were not directly elected by the people—instead the Constitution mandated that they be chosen by state legislators. This radically changed in 1913, when the Seventeenth Amendment to the Constitution was ratified, giving the public a direct vote. Electing the Senate investigates the electoral connections among constituents, state legislators, political parties, and U.S. senators during the age of indirect elections. Wendy Schiller and Charles Stewart find that even though parties controlled the partisan affiliation of the winning candidate for Senate, they had much less control over the universe of candidates who competed for votes in Senate elections and the parties did not always succeed in resolving internal conflict among their rank and file. Party politics, money, and personal ambition dominated the election process, in a system originally designed to insulate the Senate from public pressure."
—Publisher's website