Studies you can use to bolster your arguments with your electeds.
One Person, One Vote: Estimating the Prevalence of Double Voting in U.S. Presidential Elections.
This study, by professors at Stanford, Harvard, Yale, and Penn, as well as a researcher at Microsoft, reveals that CrossCheck creates 300 false positive matches for every one potential duplicate.
Center for Popular Democracy: Deepening Our Democracy.
This report shows how, in states that don't have Automatic Voter Registration, localities can begin to take the lead on registering voters. Tactics like using local government agencies, mandating that landlords make registration forms available, and others can be useful steps to helping more voters get registered.