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But Helmer has turned off some Londoners with his consistent support for a $500-million bus rapid transit (BRT) system in London, and his political leanings. Then-premier Kathleen Wynne appeared at one of Helmer’s fundraising events during the 2014 election campaign, and his partner, Kate Graham, ran for the Liberal party in London North Centre in June’s provincial election.

Holder was a two-term Conservative MP in London West.

It’s the BRT project — and the controversy that surrounds it — that makes Holder’s choice particularly significant, experts say.

Although the primary job of the deputy mayor is to cover the mayor during any absences, the two are often seen as key political allies.

There’s no rule that requires the mayor and deputy mayor to act in lockstep on every issue, Sancton noted, but given the divide between those who support BRT and those, like Holder, who campaigned against it, the move sends a message.

“I don’t think it necessary means they’re going to be in agreement on the BRT or that they have some kind of prior understanding,” Sancton said. “It’s a sign that they at least agree to talk with each other, respect each other, and work with each other.”

And setting that precedent early could be crucial for Holder, who faces a tough job of building consensus on council and setting the stage for collaboration across political or otherwise polarizing lines.

He wasn’t willing to discuss his pick with The Free Press before it’s confirmed by council.