In part two of Sway’s two-part election integrity series, Kara Swisher speaks to Trevor Potter, a former chairman of the Federal Election Commission and an expert on the dark money and opaque laws that define modern American democracy.

From witness or notary public requirements in Rhode Island to a double-envelope mandate in Pennsylvania and a single dropbox per county in Texas, Mr. Potter and the nonpartisan Campaign Legal Center are on a legal spree to fight voter suppression and voting restrictions. Millions of ballots are at stake. These court cases will help determine whose vote counts — and which candidate wins — in 2020.

You can find transcripts (posted midday) and more information for all episodes at nytimes.com/sway, and you can find Kara on Twitter @karaswisher.