Former Vice President Joe Biden has a double-digit lead over Vermont Sen. Bernie Sanders for the Democratic presidential nomination, a new CNN poll of Democratic voters nationwide conducted by SSRS shows.

Biden is now the choice of a majority of Democratic voters nationwide, according to the poll, which was taken in the days after the former vice president’s stronger-than-expected showing across Super Tuesday contests and as the field of Democratic contenders with a realistic shot at winning the nomination narrowed to two.