[...] with Democrats looking for every opportunity to focus negative attention on the billionaire candidate, Oregon Democratic Sen. Ron Wyden introduced the measure Wednesday. If they don't, the Treasury Department — which oversees the IRS — would give the returns to the Federal Election Commission, which would release them publicly. Since the 1970s, presidential candidates have typically released their returns. "Do you even pay taxes?" Wyden, top Democrat on the Senate Finance Committee, said in a written statement announcing the measure.