1) Issue enough temporary work permits so that it's easy to get into the country, and easy to get out, so non-citizens are not pressured to bring their whole families and stay permanently.
2) Penalize employers for hiring non-citizens without permits.
3) Stop giving welfare, schooling, etc. to non-citizens.
4) Change the Republican platform to pick off the more intelligent people in BO's voting blocs, i.e. stop pushing morals (Republican's weak point), and start teaching / preaching economics (Democrat's weak point).