Every time you read the news lately, there she is: in conversations about bipartisanship, the infrastructure deal, the filibuster, even the fate of Joe Biden's presidency itself. But who is Kyrsten Sinema of Arizona? And what does she want to accomplish with her outsized influence on the passage of basically any law through the Senate, with its razor thin margins?

For this week’s installation of our Summer investigation series, Mother Jones senior reporter Tim Murphy takes a look at Sinema’s political evolution. As a progressive in one of the nation’s most conservative state legislatures, Sinema abandoned her early radicalism for a new theory of change. She learned to play nice, seeking incremental progress through careful messaging and across-the-aisle relationships, and reinventing herself as a post-partisan deal-maker. Now, for the first time in her career, she holds real power. With a giant infrastructure deal on the line, not to mention the future of her party and the Senate, the world is trying to understand what Kyrsten Sinema wants to do with it. This episode is produced by Audm.