Daniel Q. Gillion demonstrates through rigorous empirical analysis that protest activism directly influences voters, increasing turnout, political donations, and challenger candidacies in affected districts. While scholars have long debated whether protest changes policy, Gillion asks a different question: does protest change electoral politics? Using data on protests, elections, and campaign contributions, he shows that exposure to protest activity increases political participation among sympathizers and opponents alike. Protests raise the salience of issues, motivate citizens who share protesters' concerns to vote and donate, and inspire some to run for office themselves. Gillion examines both left-wing and right-wing protests, showing similar mechanisms at work across the political spectrum. He traces how protest waves from civil rights through Tea Party to Black Lives Matter have reshaped electoral competition in affected areas. The book challenges claims that protest is ineffective or counterproductive, showing that its effects on elections are measurable and consequential even when policy change remains elusive. Gillion argues that protest functions as a form of political voice for those who might otherwise be ignored, forcing issues onto the agenda and compelling responses from candidates and parties. The analysis provides empirical grounding for understanding why people protest and what it accomplishes.