Presidential poll volatility continues to spark public anxiety in the US. There was an interesting story on this front The Hill by Jonathan Easley

Trying to figure out the state of the Democratic presidential race? Get in line.

Public opinion surveys have varied by the day, particularly in the early voting states of Iowa and New Hampshire, where some candidates can point to individual polls to argue they are building momentum.

Former Vice President Joe Biden has held a relatively steady lead in national polls, though an Economist-YouGov poll this week found him holding just a 1 point lead over Sen. Elizabeth Warren (D-Mass.).

A poll from The Hill-HarrisX found Biden with a healthier 15 point lead over Sen. Bernie Sanders (I-Vt.), who stood in third place in the Economist poll. Warren was further behind, winning 10 percent support compared to 31 percent for Biden and 16 for Sanders.

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