Impact of States’ Voter Laws Can Be Difficult to Identify

Voters in more than two dozen states next month will be asked to provide some form of identification before casting a ballot. How many Americans who would otherwise vote will be turned away or won’t turn up at all remains a hotly contested number. …

Scholars are divided over whether polls can pinpoint the effect of voter-ID laws. Putting aside the question of whether people can accurately forecast whether they’ll have valid ID in November, and whether they’ll vote if they do, surveys also can get different results depending on how they ask about ID. [cont.]

Carl Bialik, Wall Street Journal