Hillary ClintonHillary Diane Rodham ClintonCornyn spox: Neera Tanden has 'no chance' of being confirmed as Biden's OMB pick Groups seek to get Black vote out for Democrats in Georgia runoffs Biden's political position is tougher than Trump's MORE took on Wall Street banks, which some liberals worry she favors too much, in a campaign stop in Minnesota for Sen. Al FrankenAlan (Al) Stuart FrankenThe Hill's Morning Report - Presented by the UAE Embassy in Washington, DC - Trump, Biden clash over transition holdup, pandemic plans The Hill's Morning Report - Fearing defeat, Trump claims 'illegal' ballots The Hill's Morning Report - Biden inches closer to victory MORE (D) on Thursday.

"Al has pushed for more and better oversight of the big banks and risky financial activity, and there’s more work for him to do," Clinton said at the rally at Macalester College. 

She then pivoted to including herself among the Wall Street skeptics. 

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"Even before the big meltdown, a lot of us were calling for regulating derivatives and other complex financial products, closing the carried interest loophole, getting control of skyrocketing CEO pay, addressing other excesses," Clinton said.

"And we’ve made progress," she added. "But there’s a lot of unfinished business to make sure we don’t end up once again with big banks taking big risks and leaving taxpayers holding the bag. And Al is the one who is really shining a spotlight on what needs to happen to avoid that."

There has long been speculation that Sen. Elizabeth WarrenElizabeth WarrenInequality of student loan debt underscores possible Biden policy shift Thomas Piketty says pandemic is opportunity to address income inequality The Memo: Biden faces tough road on pledge to heal nation MORE (D-Mass.), famous for her tough stance on big banks, could challenge Clinton from the left in a presidential primary. The chances appeared to get slightly higher this week, as Warren spoke of "amazing doors that could open" in an interview with People magazine. 

Clinton has called for steps such as regulating derivatives in the past.

"We need to start addressing the risks posed by derivatives and other complex financial products,” Clinton said in a speech in November 2007, during her last presidential campaign and before the main crisis in 2008. “We can’t let Wall Street send the bill to your street.

However, Clinton has also come under fire for moves such as giving paid speeches to Goldman Sachs this year and last year. 

A Bloomberg/Des Moines Register poll this month found that 44 percent of Iowa Democratic caucusgoers view Clinton's "close ties to Wall Street" as a disadvantage, while 36 percent deem them an advantage.