Yet another Republican is opting not to run in the special Senate election in Massachusetts.

Former lieutenant governor Kerry Healey, who served under Mitt Romney and ran for governor in her own right in 2006, told the Boston Herald that she won't run for Secretary of State John F. Kerry's old seat in the special election scheduled for June 25.

"Yes, while I am grateful for and value the advice of those who have been urging me to run, I have decided not to be a candidate in this race," she said.

Healey joins a growing list of Republicans in turning down the race, including former senator Scott Brown, former congressional candidate Richard Tisei, former governor Bill Weld and Romney's oldest son, Tagg Romney.

Former Navy SEAL Gabriel Gomez and state Rep. Dan Winslow are still looking at running for the seat, and Ann Romney has yet to rule it out as well.

Psychiatrist and Fox News personality Keith Ablow is willing to run, he said Monday, as long as he has no primary challenger.

"The window is short for a primary battle,” Ablow told the Newburyport Daily News. “I think spending money on a primary, which should be spent on defeating someone in the general election, is ill-advised.” If the state and national party leadership unites around him to avoid that scenario, he said, he will run.

As a Fox News contributor Ablow has speculated about the mental health of numerous public figures -- including Vice President Joe Biden, who he suggested might have dementia, and President Obama, who he posited is for gun control because he was abandoned as a child.

On the Democratic side, Reps. Edward J. Markey and Stephen F. Lynch are vying for the nomination.