Final answer:
The size of Professor Fowler's 2010 experiment is not specified in the available references, but election studies often involve large-scale data collection, exemplified by the 10 million prospective voters sampled in a 1936 opinion poll.
Step-by-step explanation:
The experiment conducted by Professor Fowler and colleagues during the 2010 US Congressional election was significant in scale. However, specific details regarding the size of the experiment are not provided in the references available. For context, the American National Election Studies has been collecting data since 1960, polling a random sample of voters on each election.
Moreover, during historical elections, such as the 2008 General Election, the United States Elections Project documented turnout rates, providing valuable context for understanding electoral participation. Notably, in 1936, an opinion poll predicting the results of the presidential election used a massive sample size of approximately 10 million prospective voters, further exemplifying the potential scale for election-related experiments and surveys.