Fall River dentist David Steinhof plans to file his intent to run today as a Republican for election the Fourth Congressional District, the seat that will be open as a result of Barney Frank’s retirement, Steinhof’s campaign manager said.

The Republican primary field already includes Dr. Elizabeth Childs and Sean Bielat, who built his profile by challenging Frank for reelection in 2010. Democrats in the race include Joseph Kennedy III, Herb Robinson, and Jules Levine.

Steinhof considers himself a “constitutional conservative,” according to campaign manager Scott Anderson, using a term that may endear him to members of the Tea Party movement.

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“His main concern is jobs,” Anderson said.

He said Steinhof also favors a flat tax and fewer government regulations.

He has scheduled a formal announcement in Fall River on Tuesday.

Steinhof, a first-time candidate, faces a difficult road to the nomination.

Bielat built name recognition and experience in his previous run. Childs previously served as the state’s mental health commissioner under Governor Mitt Romney.

She also has secured some top-level endorsements, but she had been registered as either a Democrat or an unenrolled voter for two decades before registering as a Republican in July, just before announcing she was running for Congress.