The situation is more insidious than the political leanings of the immigrants themselves.
The more you crowd people, the more likely they will think like Democrats and vote for Democrats.
Just take a look at the map of the 2000 elections: the more densely populated areas voted for Gore.
The more dense the population, the more artificially they live.
Certain ways of doing things become habitual.
It's bad enough that the urban population is growing from the migration of people from rural areas to cities for jobs, but to add even more people from immigration is putting the political sanity of the people at great risk.
Good point and makes sense. Its not 1850 anymore and we're running out of room.