Richard TiseiSun staff photos can be ordered by visiting our Smugmug site.
Richard Tisei

Sun staff photos can be ordered by visiting our Smugmug site.

By Matt Murphy

State House News Service

LOWELL -- On the endangered incumbents watch lists of many news organizations, U.S. Rep. John Tierney is in store for a long 2014 campaign season as he now appears to be facing challenges from both sides of the aisle.

Tierney, of Salem, who represents the 6th Congressional District, is already caught up in a primary fight with two Democrats - Marblehead's Seth Moulton and former U.S. Senate candidate Marisa DeFranco.

Now, the winner of that primary election will have to face off against former Republican Senate Minority Leader Richard Tisei, who came within a percentage point of defeating Tierney in the 2012 election.

The mostly North Shore District includes the Greater Lowell communities of Bedford, Billerica, Burlington, Tewksbury and Wilmington.

Tisei, who left the Legislature in 2010 to run for lieutenant governor as Charlie Baker's GOP running mate, is expected to formally announce his second campaign for Congress on Thursday at 2 p.m. at the Wakefield America Civic Center for what his campaign - Tisei for Congress - is calling a "major announcement."

Tisei's entrance to the race does not come as a surprise. He formed a campaign committee with the Federal Elections Commission in October to explore a 2014 run and possible rematch against Tierney.

On the last day of the year in December, Tierney's campaign emailed a fundraising appeal to supporters with the subject line, "Quick, I need your help.


" "2014 is going to be a big year for us in Massachusetts' 6th District. My former opponent, Richard Tisei, looks like he'll make this rematch official just after the new year. We have to be ready," Tierney wrote.

Tisei spent more than $2.3 million on his 2012 campaign.