BOSTON (FOX 25 / MyFoxBoston.com) A spokesperson for Rep. Stephen Lynch (D) says the congressman will make an important announcement on Thursday.
Word of the announcement comes on the same day as the Senate confirmed President Barack Obama's nomination of Sen. John Kerry to the secretary of state post.
There has been speculation that Rep. Lynch would enter the special election for the Senate seat left vacant by 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.
In December, Rep. Ed Markey announced plans to run in the special election. Former Republican Senator Scott Brown is also reportedly weighing a run.
A Democratic primary has already been scheduled for April 30 and a special election is expected to be held in 140 to 160 days.
The Associated Press contributed to this report.