The presidential candidates have shown little interest in making foreclosures a top issue, but the housing crisis could literally cost them voters in the upcoming general election, NPR reported Tuesday.

More than 3.7 million homes have gone into foreclosure since 2008, leaving the campaigns for President Obama and Mitt Romney struggling to find missing voters who moved out of their residences after facing foreclosure, NPR said.

The report claims voter databases for both parties are littered with outdated names and numbers linked to voters who were forced to move after losing their homes.

Some of the worst foreclosure markets—Arizona, Florida and Nevada—remain key battleground states, making it imperative for both parties to reach those missing voters, NPR reported.

President Obama may struggle the most with old voter rolls since his party anticipates a strong “get-out-the-vote” movement will be needed to counter the engagement of Republican voters this year, NPR asserted.

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