Sen. Bernie Sanders, Vermont Independent, said in Iowa Tuesday he’s trying to gauge whether or not he’ll be able to mobilize enough grassroots support against the “billionaire class” to make a serious run at the White House in 2016.

“There’s no way we are going to address the problems facing this country without a political revolution,” Mr. Sanders said, adding that he needs to know whether he can gather the kind of grassroots support it would require to take on the Koch brothers, Wall Street and drug companies, for instance.

He said he needs to see a mass mobilization of millions who are willing to engage in “a real struggle against the billionaire class,” the Des Moines Register reported.

It’s the fourth trip to the early presidential state this year for the “democratic socialist,” who is well behind Democratic frontrunner and former Secretary of State Hillary Rodham Clinton in early polling on the 2016 field.

Asked by the paper about former Florida Gov. Jeb Bush’s Tuesday announcement that he was actively exploring a presidential bid on the Republican side, Mr. Sanders replied: “Free country.”

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