“I have no hesitation in my decision to back Governor Romney,” Rohrbacher said in a statement. “He is by far the best choice and the most electable of the candidates. Mitt can and will lead us as a people out of our current danger of an economic calamity, which is hanging over our heads.”

As Newt Gingrich has overtaken the former Massachusetts governor in the polls, Romney supporters have argued that he is a more electable candidate than Gingrich in the 2012 election.

It’s a narrative that the Gingrich campaign is trying to wrest from Romney, although most polls show Romney doing better than Gingrich in a head-to-head match-up against the president.

Still, Republican voters don’t necessarily agree that Romney is the more electable candidate. A CBS news poll of likely Iowa caucus-goers shows that 31 percent said Gingrich was more electable, versus 29 percent for Romney.

Rohrbacher, who served as a special assistant to former President Reagan, also said he was convinced to back Romney after he met and exchanged views with the candidate.

“He will lead us into an era of peace and prosperity based on his unshaken faith in those values and principles that have taken us through so many crises and made us the great nation that God intended America to be,” the statement continued. “Mitt has the ideas, the energy and the integrity to get the job done.”

It’s Romney 56th endorsement from a GOP lawmaker. Gingrich has only eight so far.