Twenty-four candidates are still in the game before the second Democratic presidential debate, just one short of a Major League Baseball roster. As with a roster, there have been moves — Eric Swalwell is out, Joe Sestak and Tom Steyer are in — and frankly, it’s a lot to keep track of. So if you hear a name or see a face and find yourself asking, “Wait, which one is she?” or “Is he the one who …” then this (updated) quiz is for you.