Backers of keeping Maryland's gay marriage law turned to Baltimore's annual Gay Pride Festival on Sunday to gather support for a looming ballot fight.

On the final day of Baltimore Pride, volunteers for both the Marylanders for Marriage Equality coalition and the re-election campaign of President Barack Obama spread throughout the festival grounds, the Baltimore Sun reported.

Maryland lawmakers approved and Governor Martin O'Malley signed a measure legalizing gay marriage earlier this year. The law won't take effect until January 1, 2013, giving opponents sufficient time to attempt to repeal the law at the ballot box in November.

Supporters passed out stickers, sold t-shirts, registered voters and recruited volunteers at the annual celebration which took place at Druid Hill Park.

“This is about people's lives,” Kevin Nix, a spokesman for Marylanders for Marriage Equality, told the paper. “It's about people getting married and protecting their kids.”

Nix added that support had grown since President Barack Obama made his historic endorsement last month.

“There's been a shift since the president came out in terms of favoring marriage equality,” he said. “We're in a strong position headed into the fall.”