Politicians who would enforce immigration laws never get the chance to be thrown out of office, because they don't get elected to start with.
Remember Pat Buchanann?
And as I said above, with the help of media brainwashing, even the people here joined in demonizing the man.
I don't believe that voters would throw out politicians who want to enforce immigration laws.
Large majorities of Americans from all social classes and ethnic groups (including legal immigrants) support restrictions on immigration, and the cowardly GOP, with control over Congress and Presidency, still won't even do so much as attempt to enforce our national borders.
It's not a matter of what the voters think (contra what has been asserted here by some) but rather who controls the media. The media sets the agenda and fills the voters minds with images and slogans and suggestions and information/misinformation/"spin".
Due to that, there is no doubt what would happen if real attempts to rectify the situation were made by the GOP without first addressing the problem of media power and control. We don't have real democracy as long as the people controlling the media can use it to frame the terms of debate and subtlely skew the opinions and emotions of the voting public.
Someone mentioned the last time we had a major roundup and expulsion of illegals: during the Depression. It may take another depression, and perhaps "Civil War 2", to bring about another such rectification.