BOSTON (AP) — State Sen. Karen Spilka says she plans to run for U.S. Rep. Edward Markey's seat if Markey is elected to the U.S. Senate.

Spilka, a Framingham Democrat, said in a letter to supporters on Thursday that she would fight to get "real results" in Congress on issues like jobs and rebuilding the nation's infrastructure.

Spilka is in her fifth term in the state Senate after previously serving in the House.

Middlesex County Sheriff Peter Koutoujian, state Sens. Katherine Clark and William Brownsberger, and state Rep. Carl Sciortino are also eyeing Markey's 5th District seat. All four are Democrats.

A special election would be held for the seat if Markey defeats Republican Gabriel Gomez in the June 25 special election to succeed John Kerry in the Senate.