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Putting Ms. Giron’s name on the ballot was one thing; defeating her will be another. A former aide to U.S. Sen. Michael F. Bennet, she won her 2010 race with 55 percent of the vote in a heavily Democratic district with strong union support.

“I am ready and eager for the September 10th election,” Ms. Giron said in a statement. “This last legislative session was my best yet and this is a great opportunity to continue talking to folks in Pueblo about all our successes. In the meantime, I continue to work hard and represent Pueblo.”

Ms. Giron also benefits from the Colorado Democrats’ formidable fundraising machine. So far, Pueblo United for Angela has raised more than $93,000, almost three times as much as the $36,000 collected by Pueblo Freedom and Rights.

Among those funding the Giron campaign is Mainstream Colorado, the Senate Democrats’ Denver-based political action committee, which has raised more than $213,000 since January from corporations including AT&T, Wal-Mart, Waste Management, Kroger and Riviera Black Hawk Casino.

But that fundraising effort has caused its own controversy: Mainstream Colorado has funneled $21,000 to the Giron camp, but several companies contacted by a reporter said they were unaware that their donations would be used to fight the recalls, noting that their 2013 contributions were made before the recall drives began in March.

“Walmart’s sole contribution to Mainstream Colorado was in January 2013 for sponsorship of a legislative dinner event hosted by Senate leadership. To suggest anything else would be inaccurate,” Wal-Mart spokeswoman Delia Garcia said in a statement.

Still, seeing Wal-Mart, which sells firearms and ammunition, on the Democrats’ list of contributors does sting a little, Mr. Head said.

“It’s unfortunate. I like Wal-Mart. My girlfriend works at Wal-Mart,” he said.

Even if both Democrats lose, the recalls won’t change the balance of power in the state Senate. Democrats now hold a 20-15 majority. If Republicans replace Ms. Giron and Mr. Morse, the Democratic majority would be reduced to 18-17.

But organizers say they hope a successful recall will send a message to state and federal legislators on the pitfalls of crossing their constituents over the gun issue, even those who look as if their expertise is limited to unclogging drains.

“If someone had sat me down at the beginning and explained what we were up against, I would have probably said, ‘No way,’” Victor Head said. “But here we are, we’ve met our goals, and we’ve got a good chance of getting this done.”