(CNN) Sen. Bernie Sanders calls himself a democratic socialist. Sen. Elizabeth Warren says she is a capitalist to her "bones."

And yet, the pair are widely viewed to be competing for the same territory in a potential 2020 Democratic presidential primary. Not that anyone should be surprised. Both Sanders and Warren made their names railing at the excesses and failures of an increasing unequal economy -- one that voters across the ideological spectrum routinely describe as unfair or, in many cases, "rigged."

Polling from a variety of sources has for years now consistently turned up evidence of frustration rooted in decades of economic dislocation, spanning both Republican and Democratic administrations. In 2018, buoyed in part by the rise of the progressive left, we're beginning to see more Americans take a deeper look at the system underlying -- and, in some cases, feeding -- their anger: capitalism.

In a Fox News poll out this week, 36% of Americans said it would be a "good thing" for the country to "move away from capitalism to more socialism," while 51% called it a "bad thing." Most of the chatter of late has surrounded socialism, but the judgment rendered here on capitalism is just as interesting. Perhaps more. On the three previous occasions the question had been asked, support for a move had never surpassed 23% (2009) and the opposition always came in at no less than 64%.

Those numbers reinforced some of the takeaways from another recent headline-grabbing survey, from Gallup, which found that positive views of capitalism among 18- to 29-year-olds had plummeted this decade, from 68% in 2010 to just 45% in 2018.

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