Washington (CNN) - The knives are out for Marco Rubio.
Ever since revelations surfaced that the Florida senator had made a series of misstatements about his family history, a Democratic-leaning political action committee called American Bridge 21st Century has compiled other instances in which Rubio appeared to get his facts wrong on the same subject.
In an exclusive interview with CNN, American Bridge president Rodell Mollineau confirmed that political calculations for 2012 were a motivating factor for aggregating the damaging material.
"Oh yeah, I think that it does. And I'm not making any bones about that," Mollineau said.
Despite pleas from Republicans, Rubio has ruled out being on the GOP ticket in 2012. But that has not stopped the chatter in Washington. Top Republicans believe Rubio as a vice presidential nominee could take Florida away from President Obama who won the battleground state by roughly 200 thousand votes in 2008.
"If he is going to be bandied about as a vice presidential candidate, don't you think people should know more about him?" Mollineau asked. "We'd like the American people to know a little bit more about Marco Rubio," he added.
The Washington Post first reported on the discrepancies in Rubio's public comments on his life story last week.
The controversy forced his staff to correct errors in the biography posted on his Senate web site.
Until last week, that Senate bio stated: "In 1971, Marco was born in Miami to Cuban-born parents who came to America following Fidel Castro's takeover." Now it reads: "Marco was born in Miami in 1971 to Cuban exiles who first arrived in the United States in 1956."
During a series of events in Florida Thursday, Rubio admitted to reporters he botched the details of his own family story.
"Do I wish I had known those dates? Absolutely. Does it change anything? Absolutely not," Rubio said.
The political operatives at American Bridge say the dates do matter. They've posted a YouTube video that shows a montage of sound bytes in which Rubio repeatedly refers to himself and his family as "exiles."
"I was raised by exiles," Rubio says in one clip. In another clip, Rubio says his family left Cuba in 1959.
The video accuses the senator of embellishing his life story for political gain and suggests Rubio is not really a Cuban exile because his parents left the island before Castro took power.
During interviews throughout his campaign for the Senate, Rubio labeled his family as "exiles."
"It's hard to be apolitical when you're exiles or raised by exiles," Rubio said in a CNN interview last year.
Rubio does not apologize. He says his parents are exiles because they could not return to Cuba under communism.
"They spent the rest of their lives, my mom is still alive, permanently separated from their nation of birth. That makes them both exiles and immigrants," Rubio told reporters.
Mollineau accused Rubio of playing a game of semantics over the definition of the term "exiles." He called on the senator to admit he "misled" voters.
"I think at this point the only person that's keeping the story alive is actually not us. I think it's actually Senator Marco Rubio," Mollineau said.
Mollineau is a former staffer for Senate Majority Leader Harry Reid. The American Bridge PAC he heads receives much of its funding from unions and high profile California contributors. It was founded by David Brock, who also launched the liberal media watchdog group, Media Matters for America.
According to Federal Election Commission records, American Bridge has collected $100,000 contributions from the American Federation of State County and Municipal Employees and the Service Employees International Union. Hollywood director JJ Abrams chipped in $37,500.
House Foreign Affairs Committee Chairman Ileana Ros-Lehtinen, a Cuban American Republican Congresswoman from South Florida, says Rubio is under attack because he could divert Latino votes away from Democratic candidates.
"They're going to try to do everything that they can to tear him down," Ros-Lehtinen said. "Marco Rubio's family is the Cuban exile experience, whether they came pre-Castro or post," she added.
At a hearing of her committee Thursday, Ros-Lehtinen mocked questions about Rubio's exile status in a query of her own to Secretary of State Hillary Clinton.
"My question madam secretary deals with my native homeland of Cuba. Although in recent weeks I feel the need to carry my papers with me to find out when it is that I actually got to the United States," Ros-Lehtinen quipped.
For now, Rubio is fighting fire with fire.
On Thursday, his political action committee appeared to make a veiled reference to the exile controversy in an email to supporters seeking contributions.
"Why are Washington liberals coordinating attacks on Marco Rubio?" the email asked.