Democratic Congressman Stephen Lynch is preparing to make a major announcement.
Lynch's campaign would not confirm Tuesday what the Thursday announcement is, but Lynch is widely expected to say he is a candidate for the Senate seat being vacated by John Kerry.
Lynch will begin Thursday with stops in Springfield and Worcester with an evening event at Iron Workers Local 7 in South Boston.
The Boston Democrat has been privately telling supporters of his plans to run, although he publicly said last week that he had not made a final decision.
Fellow Democratic U.S. Rep. Edward Markey has already announced he will seek Kerry's seat.
Former U.S. Sen. Scott Brown is considering a campaign on the Republican side.
The special election will be held on June 25. The primary is set for April 30.
This program aired on January 29, 2013. The audio for this program is not available.