Except for Ms. Warren, everyone on stage on Wednesday was looking for a breakthrough moment to lift them out of single digits in the polls.

Few got one — but some issues rarely discussed in such a prominent setting did.

Senator Cory Booker became the first candidate to mention transgender rights in a presidential debate. Mr. Castro, meanwhile, made a point of calling for “reproductive justice,” which emphasizes the socioeconomic dynamics that make it harder for women of color and other marginalized groups to get abortions and other reproductive services.

What will come up in the next round of debates? We’ll find out on July 30 and 31. (That’s right, we’re doing this all again in a little over a month.)