After undergoing surgery earlier in the week for prostate cancer, Sen. Ron Wyden appeared in the Senate chamber on Wednesday to vote in favor of a nuclear arms reduction treaty with Russia.

Wyden's (D-Ore.) surgery on Monday went "perfectly," according to his office, and he was discharged from Johns Hopkins Hospital in Baltimore on Tuesday following the procedure.

The absence of Wyden had caused worry for Democrats, not only because of his condition, but because he would be forced to miss several key votes.

Though the New Strategic Arms Reduction Treaty (START) appeared in danger of failing last week, but the treaty passed 71-26.

-- This post was updated at 3:00 p.m.