Oh hey, a non-partisan poll (NPR/PBS). Still not worth shutting down the Government for, imo; however, I get why Trump is doing this. It's his last chance to get it before divided Government.
I mean it's not like he's asking for ALL the money, it's 5 billion dollars, or 1/1000th of the ~3.8 trillion yearly budget even if you use the bigger cost of 20 billion it's 1/250, that's probably more money than was not spent just in these shutdowns.
Pretty much the only reason to oppose it is that you don't want to enforce the border, period.