Matthew Santos

Matthew Santos arrives as a little-known Democratic congressman from Texas, a former Marine pilot and moderate with a young family, talked into a long-shot presidential run by a staffer who sees something the party establishment doesn't yet. He is thoughtful, plainspoken, and visibly uneasy with the machinery of national politics he's stepping into.

The show stakes its final act on whether idealism can survive a campaign, and Smits plays that tension without cynicism or naivety, letting Santos's discomfort with dirty tactics feel like principle rather than weakness. He's compelling because the writing treats his rise as an open question, not a foregone conclusion.