When the House Committee on Science recently held a hearing on cyber vulnerabilities and our elections systems, the committee focused only on threats facing the actual systems of voting—tabulations, electronic machines, and the possibility of a “rigged election.” Experts who testified at the hearing agreed that a threat to widespread vote manipulation across many different precincts and jurisdictions is very small and unlikely. But dismissing the likelihood of cybertampering with the election tally misses an important point: Cyberattacks could shake public confidence in political institutions, sow dissent and distrust among the population, and tilt the electoral playing field. In an attack this spring, hackers—who I have been advised are from Russia —stole data from the Democratic National Committee and the Democratic Congressional Campaign Committee. They also stole voting data in Arizona and Illinois. Most recently, FBI and Department of Homeland Security officials have confirmed attempted attacks on voter registration systems in more than 20 states. These attacks align with a particular pattern that Russian-sponsored hackers have followed previously in well-documented attempts to influence foreign democratic elections in Ukraine, Bulgaria, Romania, and Philippines. They don’t just release stolen sensitive material; they also create false and counterfeit material designed to impact the outcome of elections.