Voter registration is a key measure of immigrant integration. After all, what could be more American than casting your ballot on Election Day?  When measuring immigrant voting patterns, voter registration is typically defined as the percent of naturalized immigrants (those who have become U.S. citizens) who are registered to vote. In other words, we only look at those currently eligible to vote because they have naturalized, instead of looking at the percentage of naturalized registered voters against all immigrants, documented or undocumented. The problem with that approach is we miss a big and important picture on the potential of the immigrant voting block—that many of those not eligible now, may well be eligible in the future.