With Justin Trudeau as their new leader, the Liberals could go up nine points and move into first place in Ontario ahead of Stephen Harper and his Conservatives.
That's what's shown in a new poll by Forum Research, a survey firm on considerable reputation that works by conventional professional rules.
Currently the Conservatives are in first place in Ontario with 37 percent.
The Liberals under Bob Rae follow with 29 percent.
And NDP Thomas Mulcair are at 24 percent.
But when Trudeau is suggestsed to respondents, everything changes.
Liberals climb nine points to 38 per cent and first place in Ontario.
The Conservatives drop into second spot at 35 percent.
But it's the NDP who takes the worst beating. The NDP falls five points to 19 percent.
So in effect the Conservatives and the NDP have reason to be wary of Trudeau.
They might want to consider promoting the election of one of the other seven Liberal leadership candidates who would do them less harm on voting day.