By David Ljunggren
OTTAWA, Oct 3 (Reuters) - Canadian Prime Minister Justin Trudeau's bid to win re-election next month appeared increasingly uncertain on Thursday after a campaign debate that was dominated by a powerful regional opponent.
The televised event on Wednesday night took place in the powerful and predominantly French-speaking province of Quebec, where Trudeau's Liberals are looking to pick up seats on Oct. 21 to offset expected losses elsewhere.
Pundits generally agreed the clear winner was Yves-Francois Blanchet, leader of the separatist Bloc Quebecois. Since taking charge earlier this year, the 54-year-old has worked to heal internal divisions, and his party is rising in the polls.
This could hurt the Liberals, who hold 40 of the province's 78 seats. They are targeting another 10 amid the collapse of the minority New Democrats, a left-leaning opposition party that competes for the same segment of the electorate as Trudeau.
University of Montreal politics professor Pierre Martin predicted Blanchet's continued rise would make life more uncertain for the Liberals.
"It's not an easy one to call but I think they do have reasons to be concerned because of the expectation they might gain a good number of seats," he said in an interview.
Polls show Trudeau - trying to shake off the damage done by images showing him in blackface - could retain power but with only a minority of seats, leaving him dependent on opposition legislators to govern.
Working with the avowedly separatist Bloc poses a risk for federal parties committed to keeping Canada together.
"The Bloc ... are the party to watch as a spoiler for the Liberals," said Nanos Research Chairman Nik Nanos.
"A potentially reinvigorated Bloc in a minority parliament makes the governing coalition calculus more complicated."
Blanchet said the Bloc would be happy to work with either a Liberal or Conservative minority government, studying every piece of draft legislation on a case-by-case basis.
"In most cases we could negotiate gains for Quebec in the context of a minority government," he told reporters.
Making life more complicated is the fact that the vote in some Quebec seats is split among the Liberals, the Bloc, the New Democrats and the official opposition Conservatives.
"Last night probably gave the Bloc a bit of a push," Leger pollster Christian Bourque said in an interview, predicting the party could jump from the 10 seats it has now to 18 or 20.
That could potentially put the Bloc in third place ahead of the New Democrats and holding the balance of power.
Asked about his declining popularity, Trudeau told reporters in Montreal on Thursday that any government "is going to go through experiences where people have disagreements with them."
In the streets of Quebec City, the heart of a region where the Conservatives did well in 2015, several people stopped by Reuters said they had been impressed by Blanchet.
"That is the kind of man we are looking for to represent us," said pensioner Pierre Bussiere, who had been tilting toward the Conservatives before the debate.
While Blanchet did well in Wednesday's debate, commentators generally agreed Conservative leader Andrew Scheer, hampered by his patchy French, came off the worst.
Scheer told reporters on Thursday that he "disagreed entirely" with the suggestion he had lost, saying he clearly explained to Quebecers how he would help address complaints about the high cost of living.