Sean Bielat, a Republican who ran and lost elections for Congress against former Rep. Barney Frank and Congressman Joseph Kennedy III, said Wednesday he is not going to run for Senate in the upcoming special election.

Bielat, who formed a federal campaign committee to run for the Senate seat vacated by Secretary of State John Kerry, said “regardless of press reports and a poorly phrased fundraising appeal to the contrary, I never left exploratory mode.”

“The numbers looked pretty good and the fundraising went well so I think we could have mounted a strong campaign but now is just not the right time for us,” Bielat told supporters in an email. “After spending some time thinking it through with Hope, we decided running another campaign just wasn't a good fit for our family right now, given the age of our one and two year old children and their needs.”

Bielat praised the backgrounds of the three Republican candidates already in the race. Former U.S. Attorney Michael Sullivan announced last week he will run if he can gather necessary nomination signatures using volunteers only. State Rep. Daniel Winslow (R-Norfolk) and Cohasset businessman and former Navy SEAL Gabriel Gomez are the only other declared candidates on the Republican side.

Congressmen Edward Markey and Stephen Lynch are running as Democrats.