Alli Harpoer, 32, and Jennifer Monti, 30, of Baltimore have been a couple since 2000 and are hoping to have their union legally recognized by the state of Maryland. (Michael Temchine/For The Washington Post)

Gov. Martin O’Malley (D) is prepared to sign the bill Thursday afternoon. Same-sex ceremonies, however, can’t be performed until January 2013, and opponents will work to gather the necessary signatures to put the measure on the ballot in November, according to the Associated Press. People on either side of the issue are taking to Twitter and using the hashtag #MDSSM to talk about same-sex marriage.

Similar battles are being fought across the country. After the jump, read about what’s going on in other states:

• The Republican-controlled New Hampshire legislature is considering repealing the state’s two-year-old same-sex marriage law. According to the New York Times, the “Live Free or Die” state would become the first state to reverse its position on the issue if the repeal passes. Gov. John Lynch (D) has promised to veto the move.

• Support for same-sex marriage in New Jersey has reached an all-time high after Gov. Chris Christie (R) vetoed the legislature’s move to legalize them. Bloomberg reports that a Quinnipiac University indicates that 57 percent of voters approve of same-sex marriage, compared with 37 percent who don’t.

Washington state’s same-sex marriage bill was signed by Gov. Christine Gregoire (D) in February; the law will take effect in June unless opponents can force a referendum this fall. Republican presidential candidate Newt Gingrich said last week that allowing a public vote was “the right way” to legalize same-sex unions.

More reading:

Maryland Senate passes same-sex marriage bill

Letter to the editor: Maryland’s misguided vote on same-sex marriage

Same-sex marriage in D.C.: A timeline