ANDREW MALCOLM: Nancy Pelosi faces a rare challenge to her leadership.

Pelosi’s so sure of winning that she’s already announced victory over an upstart challenger. She claims the support of two-thirds of her 195 members, purportedly unsolicited.

By traditional congressional standards, that should be sufficient to scare off any anti-establishment challengers.

There are two, no, three problems with that: First, 2016 is anything but a traditional political cycle.

Second, Pelosi could lose while everyone swears to have loyally supported her. That’s a problem with secret ballots; they’re secret, at least outside Chicago.

And third, a rather strong anti-establishment, reform breeze is blowing through the world’s politics and electorates. Ask Hillary Clinton, who still feels the pain of expecting certain victory Nov. 8.

I kinda hope she survives, to continue providing Democrats with the kind of leadership she’s been offering over the past several years.