With the Maryland General Assembly looking toward two possible special sessions this year, some lawmakers are calling for an expanded agenda to address long-term transportation funding. Gov. Martin O'Malley and House leaders have made clear that they want to devote a May special session exclusively to passing new revenue and income-tax increases to supplement a $35.4-billion budget that currently includes more than $500 million in cuts because of the assembly’s failure to pass a revenue package during the regular session. Mr. O'Malley, a Democrat, said Tuesday that is his only priority for a May special session. Other proposals would have...