Mayor Annise Parker, bolstering efforts to save her signature HERO, offered to match up to $50,000 in donations supporting the city's equal rights ordinance over the next four days.

Houston Unites announced the pledge on Monday.

Mayor Annise Parker has been a champion of the Houston Equal Rights Ordinance since day one—and today, she’s challenging us all for the final push.

Mayor Parker just confirmed that she will match up to $50,000 in donations—but only until Thursday at midnight.

This is our biggest matching gift challenge yet. And with Election Day in ONE week, it couldn’t come at a more urgent time.

Parker's pledge to match the contributions adds to her HERO tally. In September, her political organization donated $5,000 to Houston Unites. And she's unlikely to ask for her money back, unlike this Houston billionaire.

The fundraising drive comes in the final days to save the LGBT-inclusive nondiscrimination ordinance ahead of a public vote on Nov. 3. Houston Unites says it's out of cash – despite outraising opponents and entering the final stretch with more cash on hand. The funds raised this week, and matched by Parker, will keep two TV ads on the air this week, according to the organization. The group launched a new ad on Monday.

"If we can’t raise the money, we will have to make very significant cuts to our TV ad buys and voter outreach efforts," Richard Carlbom, Houston Unites campaign manager, said in an email to supporters. "If we don’t meet our goal of raising $50,000 by Thursday, we can’t run the plan we need to win."