"Students Nationwide Carry Mattresses to Protest Campus Rape."

It's the "Carry That Weight" protest.

I presume the name "Carry That Weight" is meant to evoke the Beatles song by that title, which addresses not a female but "Boy." I never really understood why the boy in the song had to carry a weight "a long time" or even what the weight was:

I never give you my pillow
I only send you my invitations
And in the middle of the celebrations
I break down

I guess when you're a Beatle you get invitations that you pass along to boys you don't sleep with. But what are the celebrations in the middle of which you break down if you've given your invitation to somebody else?

Here's what Wikipedia says about the meaning of the song:

Music critic Ian MacDonald interpreted the lyric as an acknowledgment by the group that nothing they would do as individual artists would equal what they had achieved together, and they would always carry the weight of their Beatle past. McCartney said the song was about the Beatles' business difficulties and the atmosphere at Apple at the time. In the film Imagine: John Lennon, Lennon says that McCartney was "singing about all of us."

Ah, well, now the lyric about the struggles of some males who voluntarily joined together, achieved a happy congress, and then felt burdened by the requirements of groupdom has been appropriated by females who agonize over the involuntarily juncture with males and now feel burdened by the aftereffects of something that was never good.