Should voting be mandatory in the United States?

I worked on two congressional campaigns and I can tell you where the money goes: not persuasion, mobilization. Millions get burned on ads whose only job is scaring your own voters into showing up while the other side's voters stay home. If everyone has to vote, that entire industry collapses. Campaigns would have to actually convince people instead of just herding them, and the billionaire-funded turnout machines lose their leverage. OpenSecrets tracks the billions flowing into elections every cycle. A mandate wouldn't end money in politics, but it would take away the single thing money is best at buying: differential turnout.