Maryland would become the eighth state to agree to participate in a "Super Tuesday" presidential primary to be held in March 1988, following passage of the bill yesterday. Similar measures are pending in two other state legislatures this year. The 15-state Southern Legislative Conference is spearheading the drive to make the South a more potent factor in the presidential race.

*EDUCATION AID -- Gov. Harry Hughes agreed to withdraw his objections to an ambitious six-year, $337 million proposal backed by House Speaker Benjamin Cardin (D-Baltimore) in exchange for amendments that would delay implementation until 1987 and guarantee that increases meet affordability provisions.

*BURNING TREE -- Traditional opponents of a measure that would end a tax break for the all-male Bethesda country club said they were backing off from their plan to kill the measure again this year, paving the way for enactment. The measure would strip the club of the $186,000 tax break it receives, citing its refusal to accept women members.

*SLOT MACHINES -- The House Judiciary Committee approved a measure that will allow charitable institutions in eight Eastern Shore counties to own and operate a limited number of slot machines to raise money for community activities. The measure would set up guidelines on what percentage of money must go to charity and would exempt Worcester County, where Ocean City is located.

*SAVINGS AND LOANS -- Members of the House Economic Matters Committee who threatened to kill thrift legislation if it requires only limited disclosure of unusual withdrawals from thrifts last spring, won a key concession last night.