Aaaah, NO. 
So anyone that gets any type of assistance from the State or Federal Government would not get to vote, or just certain types of assistance? Who gets to decide which benefits and/or subsidies disqualifies you to vote? Does that include farmers, students, small business, big business, bankers, unemployed, unions, contractors, veterans, Medicare recipients, etc. etc.? The list is endless.
IMHO, there are two kinds of people in America, The ones for the Constitution and the ones that are against. Intended or not, your sons idea leans to the wrong side.
Remember that the Constitution and all the Bill of Rights are to protect the minority from the majority. Meaning, whichever group that has the majority vote, can't change them to fit their ideology. That is the genius of a Constitutional Republic over a true Democracy. That is why America is so great and better than everyone else.
The problem is that every group tries to backdoor their agendas to curb our rights with new laws, regulation and taxes. This is why the fight never ends to protect our rights from the non-believers.
