Former Vice President Joe Biden’s announcement of a bid for the Democratic presidential nomination earned him an 11-point polling bounce, leaving him head and shoulders above the rest of the Democratic candidates.

A new CNN poll conducted by SSRS after Biden’s announcement on Thursday shows 39% of voters who are Democrats or Democratic-leaning independents saying he is their top choice for the nomination, up from 28% who said the same in March.

That puts Biden more than 20 points ahead of his nearest competitor, Sen. Bernie Sanders of Vermont — who holds 15% support in the poll — and roughly 30 points ahead of the next strongest candidate, Massachusetts Sen. Elizabeth Warren (8%).