The disruptive power of technological innovation is one of the defining features of modern life. The presidential nomination process is no exception. Changes in communication technology have profoundly shaped how presidential candidates conduct their campaigns. First radio, then television, and more recently the internet have successively emerged as essential tools for effective political communication. A presidential candidate cannot compete without embracing the new communication technologies of the day. But the adoption of new technology has relentlessly increased campaign costs for more than a century. This chapter examines how technology has shaped the presidential nomination process, making the pursuit of the White House an ever more expensive proposition.