3. Constitutionally Qualified Wisconsin Voters who do not Possess a Drivers License are Disproportionately Elderly, Indigent, or Members of a Racial Minority.
"The touchstone of the voter identification system is the drivers license.  Statewide, 80% of men and 81% of women possess a valid Wisconsin drivers license.  For minority members, the picture is substantially different, however.  In Wisconsin, 45% of African-American males and 51% of females possess a license.  As to Hispanics, 54% of males and 41% of females have a Wisconsin license.  23% of residents age 65 and older do not possess a drivers license."
So there you have it in a nutshell:  the ID requirements present a substantial burden which falls disproportionately on minorities, elderly, and the disabled who are constitutionally eligible to vote.  But even worse, it can't even be said that the policy will reduce fraud (of which there's scant proof to begin with).  There's been a lot said in this thread in support of ID requirements based on posters opinions and anecdotes of how difficult it's been for them to obtain ID.  But those who have studied the issue (e.g., Brennan) and presented evidence have come to a different conclusion.  As for me, I'd prefer far ranging public policy to be evidence-based rather than opinion-based.