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Some lawmakers privately questioned whether the governor was distracted by his role as chairman of the Democratic Governors Association, which required him to attend out-of-state events, lead fundraising efforts and speak out on national politics. Democratic governors elected Mr. O'Malley to the post in December 2010 and re-elected him last month.

In addition to making another attempt at getting the same-sex marriage and offshore-wind bills passed, the governor will make a second try at limiting septic tanks in new housing developments.

Failures this year could deal a major setback to any national ambitions Mr. O'Malley might hold, said Todd Eberly, coordinator of public-policy studies at St. Mary’s College of Maryland.

“He needs to have a resume and portfolio of legislative accomplishments, and at the moment he lacks that,” Mr. Eberly said. “He has to raise his profile, and he has to be more involved, but when you raise your profile and one initiative fails, that will really reflect poorly on you.”

Other proposals in the assembly likely will include shifting some teacher pension costs to counties, raising other fees and expanding the state’s gambling enterprise by adding a slots casino in Prince George’s County or legalizing table games.

State Republicans, who are heavily outnumbered in the House and Senate, have spent months criticizing the anticipated tax increases and contend the governor’s “balanced” approach focuses too much on adding revenue rather than eliminating spending.

“Instead of talking about more taxes, maybe the governor should take a good look at what he’s doing with our current dollars,” said Senate Minority Leader E.J. Pipkin, Cecil Republican, who has accused Democrats of using tax increases to funnel money from rural counties into urban areas. “We need to fight the fight and say this is wrong and that this is hurting working families in Maryland.”

The assembly is expected to consider more than 2,000 bills during its session, and one of its earliest tasks will be approving a new map of the state’s legislative districts.

The session is scheduled to end April 9.