For her part, Warren has espoused policies such as a wealth tax and universal child care, which critics said are admirable but unworkable.
Virtually all the Democratic candidates have pushed for increased taxes on the wealthy, such as taxing their assets instead of just their incomes.
Interestingly, some analysts hold that if either Sanders or Warren slip in the polls, the other will surge ahead of Biden.
"As long as Sanders and Warren both are in the race, they will split the progressive vote and help Biden hold his lead. If one of them falls back, that would allow the other progressive to move forward and overtake Biden," Brookings Institution Senior Fellow Darrell West told Xinhua.
Experts differ on what a Biden nomination would mean in terms of ideology. Some argue that he would be pulled toward the left by the rising tide of the party's left wing, while others believe he would remain moderate. Others believe the truth is somewhere in the middle.
Galdieri said that if Biden becomes the nominee, "he'll want to take steps to show that the more liberal folks in the party will be part of the administration. He can do that with his VP choice and with the policy commitments he makes as the nominee, and by securing the support of the more liberal candidates in the race."
West said that, to get the nomination, Biden would not have to take a hard left turn.
"There is no reason for Biden to shift substantially to the left because he will never pry many votes away from the really progressive candidates," West said.
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