Genuine question: Will he be able to do much with his party only holding a minority of the seats in the Congress?

his first term will be either innocuous or chaotic

tends to be the case for most elected left-wingers, really - institutions are always blocking us in one way or another, that's their role

how he's going to ride this fight and communicate with people is key, if he manages to show that the ensuing chaos isn't his fault, it can work out

Depends on what he's willing to do with existing organizations