It's still a non-issue, because it's non-relevant.  Take any random judge in the US, shy of the SCOTUS, and they wear a hat with Trudeau's "Because it's 2016" on it. Would anyone seriously think that overt support for Trudeau would translate into a ruling in that court room that would be biased?

Before you answer that, look at this:

http://lawnewz.com/high-profile/judge-wears-anti-trump-pussy-hat-to-court/

That's an overt anti-Trump statement in a US court room, in Texas, and progressives were falling all over themselves to excuse the action and to justify why she should be allowed to continue doing it, and shouldn't be disciplined for it. If they are already making excuses for opposition on the bench to a US Presidential candidate, then would they care if that judge supported a Canadian politician, overtly?