Also, point out to your right wing, Ronald Reagan loving friends that Reagan was the original amnesty president. He kicked open the door to the millions of illegals who are "ruining the country".
Also point out to them that Ronald Reagan borrowed more money than all presidents before him COMBINED, from George Washington to Jimmy Carter. Save that for when they talk about Obama spending so much and how fiscally irresponsible Democrats are.
Oh, and don't let them get away with responding that he HAD to spend that money to beat the Soviets. Aside from the fact that communism had ruined them (leaving us to blow gently to knock down the paper tiger they had become), remind the dopes that we fought huge wars and got out a depression prior to Reagan, yet he STILL borrowed more than all presidents before him combined.
I'm not saying that we can ever really convince that insane(ly stupid/misinformed) 10-20% of the population. The best we can hope to do is sometimes shut them up and inject the tiniest bit of doubt into their pea sized brains, even if they don't outwardly admit it.
If nothing else it's our job to keep their bullshit from being passively absorbed/repeated by the uninformed masses.