alastair mactaggart t s alarmed. >> voting is, for me, the mostal ming one.dates in the laste presidential election, in three states... >> narrator: he began a solitary campaign. >> we're talking about convincing a relatively tiny fraction of the voters in a very... in a h hdfulf states to either come out and vote or stay home. anremember, these companie know everybody intimately. they know who's a racist, who's misogynist, who's a homophobe, who's a conspiracy theorist. they know the lazy people and the gullible people. they have access to the greast trove of personal information that's ever been assembled. they have the world's best data scientists. d they have essentially frnttionless way of communicating with you. this is power. >> narrator: mactaggart started a signature drive for a californrn ballot initiative for a law to give consumers control of their digital data. in all, he would spend $4 million of his own money in an of silicon valley.the goliaths google, facebook, at&t, and comct all opposed his initiative. >> i'll tell you, i was scared. fear.