There may not be a lot of bi-partisan left in this country, but people hating to wait (traffic) may be one. Bush and Trump never really came/come to SF, but Clinton, Obama and Biden did. And man would they F up traffic.
I would see friends that post progressive comments/memes all the time on social media actually complain about these Presidents f'ing up their schedules. In a light hearted way it's interesting to see what the breaking point is for some of the most partisan/tribal people, and traffic is one of them.
I would be pissed too for an event being delayed whether I liked the President or not.