As the 2016 Democratic presidential candidates steel themselves for their first primary debate on Tuesday, former Secretary of State Hillary Clinton continues to lead the field in national polls - but Vermont Sen. Bernie Sanders is close behind, and Vice President Joe Biden, who's still deciding whether to run and will not be on the debate stage Tuesday, could alter the landscape significantly if he enters the fray.
A CBS News poll released Sunday found Clinton ahead of Sanders by 19 points, 46 to 27 percent, among Democratic voters nationwide, with Biden coming in third at 16 percent. All the other candidates were at two percent or less. Without Biden in the mix, the poll showed Clinton expanding her lead, bes...
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