(Bloomberg) -- The next debates for the Democratic presidential nomination may be limited to 10 candidates, with half the pack apparently failing to achieve the qualifying milestones, according to the latest sanctioned polls released Wednesday.A Quinnipiac University survey found that former Vice President Joe Biden leads the pack with 32% support among Democratic and Democratic-leaning voters. Biden is followed by Senators Elizabeth Warren at 19%, Bernie Sanders at 15%, and Kamala Harris at 7%. South Bend, Indiana, Mayor Pete Buttigieg got 5% and entrepreneur Andrew Yang received 3%, but no other candidate exceeded 1%.A USA Today/Suffolk University Poll released Wednesday found similar results, with Biden retaining a wide lead at 32%, Warren at 14% and Sanders with 12%. Only three other candidates scored above 2% in this poll: Buttigieg, Harris and Yang. Former Texas Congressman Beto O’Rourke and New Jersey Senator Cory Booker were both at 2%.The polls, which on the list sanctioned by...