Listen: With Delahunt Out, Expect A Lively Congressional Race

Massachusetts Rep. William Delahunt will not run for re-election, the seven-term Democrat said Thursday night, a decision he said was not politically motivated. Delahunt faces criticism for his handling of the 1986 Amy Bishop case in Braintree, when Delahunt was Norfolk County district attorney.

Delahunt said he had been considering leaving Congress for several years.

"The decision had nothing to do with politics," Delahunt said in a statement. "I’ve been wrestling with this decision for a while."

Speaking to Morning Edition on Friday, WBUR politics reporter Fred Thys covers all the angles of Delahunt's retirement and looks ahead to what he says "could be the liveliest congressional race" in nearly a decade.