Supporters of Governor Martin O'Malley's plans to make Maryland the seventh state to legalize gay marriage will rally on Sunday.

Speakers scheduled to attended the Frederick city event include state Senator Ron Young, Delegate Galen Claggett, and state Attorney General Doug Gansler.

In 2010, Gansler issued an opinion which concluded that Maryland's highest court would likely decide in favor of recognizing the marriages of gay and lesbian couples performed in other states. The opinion, which arrived a week before a gay marriage law took effect in neighboring District of Columbia, essentially instructed state agencies to recognize the marriages of gay couples performed in other jurisdictions over the objection of state law which bans such unions.

O'Malley endorsed the opinion, saying it was “sound advice,” but gay marriage foes threatened to impeach Gansler.

A gay marriage bill fizzled in the House of Delegates last year after clearing the Senate.

The rally will also include members of religious faiths backing the measure, including the United Church of Christ and the Episcopal Church.

Opponents of the bill will hold a counter rally at Lawyer's Mall on Monday in Annapolis.