Has Bernie Sanders already peaked?

Socialist Bernie Sanders, facing sharp competition on his left, is seeing support flag for his 2020 Democratic presidential bid.

The independent senator from Vermont dipped to 13% support in a Fox News poll of Democratic presidential primary voters released Sunday, still in second place behind former Vice President Joe Biden, but down from 17% in May and 23% in March. An Economist/YouGov poll released last week found Sanders had 12% support in the crowded field, down from 15% the week before and in third place behind Sen. Elizabeth Warren, D-Mass., who had 16% support.