"I intend to speak in support of defunding Obamacare until I am no longer able to stand," Cruz vowed Tuesday. "All across this country, Americans are suffering because of Obamacare. Obamacare isn't working."
At one point Tuesday night, the senator from Texas read the Dr. Seuss children's classic "Green Eggs and Ham" to his daughters.
At 9 a.m. Wednesday, Cruz was alone on the floor, except for the presiding officer, Sen. Dick Durbin, D-Illinois.
There were no spectators in the general public's area of the balcony.
Cruz showed no sign of stopping. Earlier Wednesday, he said there will come a point when he can't, "but we have not yet reached that point."
Just a bit earlier, Sen. Pat Roberts of Kansas took the microphone and asked Cruz how he's doing.
"I am doing fabulous," Cruz replied.