From a reader:

The Democrats and the labor unions are the parasites, not the illegal aliens. The Dems and labor chiefs need a fresh crop of impressionable, uneducated and scared people to bring into their fold.
Labor union membership is at a historically low number. Democrats have been consistently losing national elections. 20 million illegal aliens is the political equivalent of discovering gold.
If you want to “think like an economist” remember that Democrats are alarmed that conservatives have higher birth rates than liberals. The numbers are trending toward a long-lasting Republican majority.
By getting in front of amnesty advocacy the Dems and labor unions are doing all they can to a capitalize on a whole new crop of ethnic voters. Thus, the parasites can survive another day.