There are chances that Joe Biden, sooner than expected, will come under pressure at the time of deciding whether to challenge Hillary Clinton for the White House.

This is because the liberal anxiety has encouraged multiplying grassroots supporters to wonder if the vice-president might be knocked from his perch of studied neutrality and into a presidential bid.

A third-party political action committee has urged Biden to challenge Clinton from the left in the flaming controversy over her email arrangements.

According to Reuters/Ipsos poll earlier this month, Clinton’s popularity among Democrats fell 15 points, following revelations that she had used a private email account for official work as secretary of state.

Clinton was accused of using the account for hiding her correspondence from the public eye, but she denied wrongdoing.

The Guardian has learned that this third-party political action committee has ballooned tenfold, even as the advisers close to the vice-president have said that he will wait and see about a 2016 run and is still ‘seriously considering’.

There are hints that the Democratic search for alternatives to Clinton may be more heartfelt than previously thought.

An earnest progressive case for an Al Gore candidacy that emerged last week and the email controversy have created air pockets in Clinton’s popularity ahead of her expected run.

Republican candidates have launched formal campaigns and the Clinton machine is also not far behind, seeing which Biden supporters, for the first time, have displayed organizational structure.

Director Will Pierce told the Guardian that a Draft Biden web site has gone from a list of 2,000 supporters to 20,000 backers nationwide, last week.

In the past few months, Biden has said that he will wait until summer before coming to a decision regarding whether to jump into what would be a battle against Clinton for the Democratic nomination for president.