Yep, although Trump's margin of support isn't as great here, as it is among registered/likely Republican voters who've been polled.
Fact is, Trump is dominating nearly every demographic that's been polled so far. That's not to say that he out-polls Hillary or Bernie among Democrat voters, but of those Dems who are thinking of jumping ship in this election, Trump is, far and away, their first choice.
The time to battle Hillary or Bernie will come and Trump has demonstrated that he can and will battle. And Bernie and Hillary are both vulnerable in their own ways and neither of them has had to stand on a national stage in front of the whole country and defend themselves against against a determined opponent armed with the truth. We’ll see what happens.