The 17th Amendment's Hidden Cost
Before 1913, the cost of "winning" a Senate seat was political, not financial. A prospective senator needed to cultivate relationships with state legislators, demonstrate knowledge of state interests, and earn the trust of his state's political leadership. Corruption existed (some state legislators were bribed), but the total cost was trivial compared to modern statewide campaigns. [1]
Direct election changed everything. Suddenly, Senate candidates needed to reach millions of voters across an entire state through advertising, travel, staff, and media. Todd Zywicki's public choice analysis argues that this structural change created an entirely new market for political influence: where once a senator's "clients" were a few hundred state legislators, they were now millions of voters, reachable only through expensive mass communication. [1]
The same dynamic already existed in the House, but the Senate had been insulated by design. The Founders gave senators six-year terms and state-legislature selection specifically to shield them from the short-term pressures of popular opinion and the corrupting influence of campaign fundraising. The 17th Amendment removed both shields simultaneously.
The Cost of a Senate Seat
The average cost of a winning Senate campaign in 2022 exceeded $26 million. Several races topped $100 million in combined candidate and outside spending. In the 2020 Georgia runoffs, combined spending exceeded $800 million for two Senate seats. These numbers would have been unimaginable, and unnecessary, under the original constitutional design.