The gain in Democrat voters will not be that great; you KNOW the illegals are already voting illegally and have been for years for the Democrats. It's just a matter of legalizing the illegal votes.
No basis in fact.
Very few legal aliens vote illegally before becoming citizens. The same applies to illegals who are two steps away from voting status.
This is why this amnesty is such a betrayal. It will make a huge difference in the voting rolls in the years to come. Consider also how many Legal immigrant relatives these amnestied illegals will be be able to bring in once legalized.
My tens of millions more will arrive. So, it will increase the Dhimmi base.