(Pablo Martinez Monsivais/AP)

By Thursday afternoon, several more Cabinet members — including Secretary of State John Kerry, Attorney General Eric Holder, Housing and Urban Affairs Secretary Shaun Donovan, Homeland Security Secretary Janet Napolitano and acting Environmental Protection Agency chief Bob Perciasepe — had also pledged to return or donate a chunk of their pay.

Of course some folks — such as Obama and Kerry — will hardly feel the loss, since they’ve got millions — unlike the more than 1 million federal workers who will be furloughed in coming weeks.

Many senior agency officials have also begun chipping in. Other less-well-heeled officials may feel obliged, leading to what might become a problem of “sacrifice creep.” (The top folks may have to proclaim a cut-off at the deputy or undersecretary level.)

For now, we’re still just waiting to see who’s going to be the last Cabinet member to sign up.