Maxime Bernier is still leading the Conservative leadership race — but Erin O’Toole’s support is up from last week, while Andrew Scheer’s appears to be stagnant.

According to the latest iPolitics CPC Leadership Tracker, powered by Mainstreet Research, 28.41 per cent of Conservative party members say Bernier is their first choice.

Mainstreet reached 9,111 Conservative Party of Canada members from May 11-14 and found — with a margin of error of +/- 1.01 per cent, 19 times out of 20 — that while Bernier is still leading, O’Toole is closing in on both Bernier and Scheer.

Of the respondents, 63 per cent said they had already voted in the leadership contest.

O’Toole claims 15.20 per cent of Conservative members who say they’re voting for him as their first choice. Last week, O’Toole’s first-choice support was at 11.87 per cent.

Scheer had the first-choice support of 19.24 per cent of Conservative members last week; he’s moved up marginally to 19.54 per cent.

For the first time in the race, Michael Chong is in fourth place and ahead of Kellie Leitch. Lisa Raitt has fallen behind Pierre Lemieux.

Mainstreet Research President Quito Maggi said O’Toole’s “got momentum” and that it’s good news for his campaign.

Maggi said that while O’Toole’s rise may not be enough for a win, it will diminish Scheer’s chance of winning because the two are fighting for the same votes.

“Scheer’s stalled,” said Maggi, adding Scheer has peaked in Quebec, while both O’Toole and Scheer are leading Bernier on second and third choice support.

“I don’t see much room for (Scheer) to grow, especially when you start looking at second and third choices.”

Maggi said he’s reluctant to say Bernier’s going to win at this point, because there’s still a small chance of someone catching him — but time is running out.

The iPolitics CPC Leadership Tracker, powered by Mainstreet, will be tracking the Conservative leadership race until members pick the next leader on May 27. For additional information on methodology and to subscribe to in-depth updates, click here.