According to Open Secrets, the second-largest for-profit prison operator in the country, GEO Group, is one of the top contributors to Marco Rubio's presidential campaign. Between 2013 and 2014, GEO Group gave Rubio $41,500, more than any other presidential candidate. The group is the ninth highest contributor to Rubio's campaign.

Is that a problem? Prison reform advocates think so, pointing to Rubio's actions as an elected official that have helped for-profit prisons — including a $110 million state contract that went to GEO back when he was Speaker of the Florida House.

"On a system that makes them wealthier the more people there are in jail, the only reason they would lobby these sort of things is because they expect their money to have a financial return," says Paul Kruger, executive director of Florida's chapter of Citizens United for Rehabilitation of Errants, a prison reform advocacy group.

Rubio's campaign hasn't returned messages from New Times on his donations from GEO Group. We'll update this post if we hear back.

The presidential contender's ties to the for-profit industry are not new. And prison reform activists have always been wary of the lucrative connection between for-profit prisons and politics. But Rubio's ties are gaining steam online thanks to a petition demanding that Rubio cut ties with GEO Group for good now that he's running for president.

"Your ties to the prison industry go back to your years in the Florida state legislature and they’re disturbingly close," the petition states. "A presidential candidate should not be associated with imprisoning people for profit. You must break ties with the for-profit prison industry."

The for-profit prison industry is big business, raking in almost $3 billion a year nationally. Boca Raton-based GEO Group operates prisons throughout the southeast and since 2009 have added 7,600 new prison beds and grown by 10 percent.

Advocates point out that that Rubio's ties go beyond just taking donations. Back in 2006, Rubio hired Donna Arduin as an economic consultant. She's a former trustee for GEO Group.

In 2011, after being elected a Florida state senator, Rubio hired Cesar Conda as his chief of staff. Conda is the co-founder of Geo Group's main lobbying firm, Navigators Global. While working under Rubio, Conda was still earning $150,000 from Navigators Global from a stock buyout agreement. In 2014, Conda went to lead Rubio's PAC, Reclaim America. It was during Conda's management that GEO Group became one of Rubio's top-10 contributors. Now, Conda is working back at Navigators Global.

According to Open Secrets, Geo Groups top lobbying issues are homeland security, immigration, and law enforcement. Prison reform activists worry about the effect of the private prison industry's big bucks in politics.The United States is the world's largest jailer and roughly 1.6 million people are incarcerated at any time, and 8 percent of those people are in private prisons. This number is expected to grow as states fail to allocate a proper budget to build new prisons. State governments then turn to private prison operators like Geo Group to house prisoners.

Kruger contends that the companies are fueling a prison-industrial complex as they funnel big bucks into politics. He believes that Rubio — or any elected official in politics — shouldn't accept money from for-profit prison groups.

"They don't do it because the guy is handsome," Kruger says. "They want to decide who goes to jail and for how long."

