Manitoba’s Progressive Conservatives are looking at a landslide victory Tuesday and the incumbent NDP could be facing its worst electoral defeat since the late 1980s, a new Mainstreet/Postmedia poll shows.

The Tories now have 57% support among decided voters, their highest number since Mainstreet began regular pre-election polling in January, according to Friday’s poll. The NDP has shown no growth in recent weeks and remains at 25%. And Liberal support has plummeted, now down to 9%, tied with the Green Party.

“I think (the Tories) are peaking at the perfect time,” said Quito Maggi, CEO of Mainstreet Research. “I expect to see a mega majority.”

The desire for a change in government is so strong — driven mostly by Manitobans’ dislike of NDP leader Greg Selinger — that even Liberal supporters are now moving to the Tories to ensure an NDP defeat, said Maggi.

Liberal support dropped seven percentage points over the past week and it all went to the Tories.

“I’ve almost never seen that kind of mass movement of vote, except maybe in the last federal election when people really, really didn’t want (former prime minister) Stephen Harper,” said Maggi.

Liberal support began to tank two weeks ago after a series of campaign gaffes and the loss of six candidates. But things went from bad to worse for Liberal leader Rana Bokhari this week after a poor performance in the campaign’s only televised leaders’ debate Tuesday.

Mainstreet’s latest poll was taken Thursday, two days after the debate.

“I predict that (the Liberals) just go back to the one seat they had,” said Maggi. “Rana Bokhari will be a very distant third in Fort Rouge.”

The Tories continue to increase their support in Winnipeg, where they’re now poised to win seats that have traditionally been NDP strongholds. Among decided and leaning voters, the Tories have 47% of the vote in Winnipeg, virtually unheard of for the party in recent decades. That’s up from 40% support among decided and leaning voters compared to two weeks ago.

Meanwhile, the level of support the Tories are getting outside of Winnipeg continues to soar and the NDP’s three northern seats may now be in jeopardy, said Maggi.

Tory support among decided and leaning voters outside of Winnipeg is now at a staggering 68%, up from 55% last week and 53% the week before. Which likely means Flin Flon, Selkirk and Brandon East, longtime NDP strongholds, are now in play for the Tories.

The NDP won only 12 seats in the 1988 election, the last time they were decimated at the polls. They’ll likely win a similar amount this time around, maybe less. But unlike 1988, it will be the Tories who will pick up virtually all of the NDP’s lost seats, given the Liberals’ complete collapse in this election.

The only thing the NDP can do now is to protect what few seats they may have left in Winnipeg, like Minto and Point Douglas. Annihilation is staring them right in the face — as party members told Selinger two years ago when they asked him to leave — and the most they can do now is mitigate the damage.

The chickens are coming home to roost.

On your mobile device, click here to see the full poll results.

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