Dr. Herbert J. Hoffman, a retired psychologist, is traveling the state today to announce his candidacy for the U.S. Senate.

He’ll be in Portland City Hall at noon, the Statehouse Welcome Center at 2 p.m. and the Bangor Motor Inn at 4:30 p.m., according to his campaign. He will run as an independent.

If Hoffman gets the signatures required to get on the ballot, he will be in the race that features incumbent Republican Sen. Susan Collins and Democrat U.S. Rep. Tom Allen. Also, Laurie Dobson of Kennebunkport has said she plans to run as an independent.