Holder cannot convert them into citizens. There’s a citizenship process, and also, no general amnesty has been declared for those that came after the last amnesty years ago.
However, precisely what Holder and DHS have done is refuse deportation unless they have serious felonies on their records. Of course they get to define “serious”. THen they will offer them work permits. So in effect what you have is resident and worker status.
That STILL does not qualify you to vote.
Believe me, if they had the power they would pass a general amnesty and thereby convey citizenship status on all of them that have resident status today.