In an ABC News/Washington Post poll released this week, 39 percent of Republicans and Republican-leaning independents said Gingrich does not have the kind of personality and temperament it takes to serve effectively as president, a large group to lose on so basic a qualification. An additional 11 percent, moreover, were uncertain.
When pitted against President Obama and even other Republican presidential candidates, Gingrich fell behind.
Gingrich and his wife were in Plaistow, N.H., Wednesday to screen their documentary, "Nine Days that Changed the World," and a book signing at a high school.
At an event at C&M Machine Products Inc. earlier in the day, Gingrich signed the "Strong America Now" deficit-reduction pledge, which vows to eliminate the deficit without adding new taxes.
Gingrich's next public appearance is slated for Sunday evening when he delivers a major foreign policy speech at the Republican Jewish Coalitions' Summer Bash in Beverly Hills, Calif.
ABC News' Jonathan Karl and Gary Langer contributed to this report.