They aren't coming to vote.
They're coming to make babies.
That, too, but that takes longer than the Left plans for the immediate future. I listened to one commenter on Fox last night who said that the migrant flow across the border was up to 60,000 a month. If that is remotely accurate, we are being inundated by a human wave attack and the Rats will undoubtedly get as many of these people registered and voting to make sure 2020 reverses the Trump aberration and that their rule is never again challenged. We either stop the attacks or the demographics will end the US as we know it, almost immediately.