Sen. Dayton on ricin discoveryby Cathy Wurzer, Minnesota Public Radio
A suspicious white powder has shut down the U.S. Senate office buildings in Washington, D.C. Officials have confirmed that the poison ricin was discovered in Senate Majority Leader Bill Frist's office mailroom yesterday. At least sixteen people were later decontaminated, but Sen. Frist said no one was expected to get sick. The U.S. Capitol building nearby is expected to be open today, and the Senate is expected to convene today as well. Morning Edition host Cathy Wurzer spoke with Minnesota Sen. Mark Dayton.