The overarching goals of political communication rarely change, yet political communication strategies and activities have evolved a great deal over the course of American history. The changes in political communication have been abrupt, occurring during three periods that I identify as Political Communication Revolutions (PCR). A PCR disrupts long, relatively stable periods that I call Political Communication Orders (PCO). Each of the three successful PCRs in American political history followed similar revolutionary cycles, which suggests that revolutions in political communication take place through a recurring process. I identify this recurring process as the PCR Cycle, which begins when successful new ICTs diffuse rapidly into American homes. It is at this point that political actors must choose if they want to utilize these new tools to innovate their political communication activities. The PCR Cycle can be used to explain repeated patterns in why major political communication change occurs, compare changes occurring throughout history, link ongoing changes during the current revolutionary period, and provide a stable theoretical structure upon which ongoing research on the intersection of the Internet and politics can be rooted. Through historical research of campaign innovation, and original analysis of 2010 senate campaign websites, I find that those political actors with more resources, those who are positioned as political challengers, and those involved in competitive political contests are more likely to innovate earlier than others. The current PCR is unique in that the interactivity of the Internet dramatically expands the number of people able to create as well as consume political information, producing the potential for a decentralizing and democratizing effect on American politics. My study concludes by evaluating the extent to which this decentralization is taking place, primarily through an original web survey of politically active Internet users. I find that the Internet is decentralizing political communication especially in terms of forwarding information and reading and watching political news, but that a very small number of political actors still dominate the generation of new political information. This research should contribute to literature in political communication, the emerging intersection of information technology and politics, and American political development.