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“If it works, I’m a ‘yes’ guy. I’m pretty emotional about it because that’s my story,” said Mr. Ehrlich, who in his first year as governor in 2003 signed legislation he got through the Democrat-controlled General Assembly to open the state’s first charter school.

While he carried job-approval ratings above 50 percent into his final year in office in 2006, it wasn’t enough to prevent a loss to Mr. O’Malley, who won 53 percent of the vote to Mr. Ehlrich’s 46 percent.

Mr. Ehrlich remained in the public eye, hosting a commentary program with his wife, Kendel, for several years on WBAL Radio and making frequent popular appearances on the WJFK Radio program the Sports Junkies.

Mr. Ehrlich’s attempt to win back the governor’s mansion last year fell short, with Mr. O’Malley securing 56 percent of the vote to Mr. Ehrlich’s 42 percent. The campaign was marred by charges that a longtime Ehrlich aide tried to suppress black votes in the waning hours of Election Day, using robocalls to instruct Democratic voters to stay home because President Obama and Mr. O’Malley had won.

Mr. Ehrlich, who last week testified as a character witness in support of his onetime aide, Paul Schurick, declined to comment on the trial, in which closing arguments concluded Monday.

Mr. Ehrlich acknowledged missing elected office a bit, particularly being governor, “because you can just wake up and do things,” but he reiterated that he is finished with Maryland politics.

He said he’s happy in his first nine months at D.C. law firm King & Spalding but is still not part of Washington culture, preferring instead to help Mr. Romney, write at night and spend time with his wife and two boys, which includes helping coach 12-year-old son Drew’sfootball team.

He says books sales have been good, including orders for more than 1,000 copies at a signing last week at a Maryland Republican Party function, and that reviews have been largely fair, but split between the liberal and conservative press.

“No surprises,” Mr. Ehrlich said, adding that he already is 50 to 60 pages into a second book, which will focus on “a new American social contract” and is “a natural extension” of the first one.

“We’re living football, politics and family,” Mr. Ehrlich said.