The senior U.S. senator from Maryland has agreed to co-sponsor legislation that would repeal the Defense of Marriage Act after LGBT rights supporters sent a petition of nearly 3,000 names to her office urging her to support the bill.

Sen. Barbara Mikulski (D-Md.) announced via her Facebook page on Thursday that she would become a co-sponsor of the Respect for Marriage Act, which is sponsored by Sen. Dianne Feinstein (D-Calif.).