If there are 30 million illegals in America, that's enough to create nearly 50 congressional districts. States with high numbers of illegals might be GOP for a while but it won't last as the anchor babies start to grow up and vote.
“They don’t even need to vote to create new congressional districts and all the resulting costs.”
California is your case in point. If not for the extra Democrat congressional districts created by illegal aliens 0bamacare would not have passed.