Photo by Jimbo3DC Supporters of marriage equality packed the gym at Northwest’s Kennedy Recreation Center Monday night for a “Rally for D.C. Marriage Equality.” The mood was celebratory on the eve of the D.C. Council’s final vote on a bill legalizing same-sex marriage in the District, which is expected to pass easily later today. Sponsored by the Human Rights Campaign, the rally brought together residents, council members and groups from the African-American and faith…