While the presidential candidates continue to pretend to support border security, they’re missing almost half the problem — visa overstayers. My center has a new paper out by a former Foreign Service officer on the ridiculous laxity of visa processing, even all these years after 9/11. Fully three-quarters of all visa applications are approved — of the top ten source countries of illegal aliens, only one (Guatemala) has a visa-issuance rate of less than 50 percent. So even if the “virtual fence” worked and McCain’s idea of having border governors certify the security of the border were not a bogus gimmick, it would be irrelevant to this large part of the problem.