Voter ID laws are at-issue across the country, with newly Republican-controlled legislatures having passed them in numerous states after the 2010 election.
But thanks in part to the courts having struck down the laws in some states -- including Wisconsin, Arkansas and Pennsylvania -- one-fifth of the 50 states will be requiring some form of ID at the polls on Nov. 4. And seven are requiring photo ID.
Most states still request some form of ID but don't require it. Another 20 states don't require identification.
In case you're wondering where your state is at in all of this, a helpful graphic from the Post's graphics team. And here is more background information from the National Conference of State Legislatures.