The explosive enrollment growth of for-profit colleges in recent years has been aided by the lead-generation industry, a little-known collection of online marketing companies that aim to connect salespeople with the phone numbers and emails of potential customers, the Huffington Post reports. For-profit colleges have already come under fire for aggressive recruiting [1] tactics targeting veterans [2] and low-income students eligible for government loans and grants. Now, one of the nation’s largest lead generation companies has disclosed that attorneys general in 15 states [3] have inquired about marketing websites directed toward veterans who have earned generous federal tuition benefits. QuinStreet Inc., of California, noted in a securities filing last month that the company had received an investigative demand letter from Kentucky Attorney General Jack Conway [4] and others. The letters questioned whether QuinStreet sites including www.gibill.com [5] and www.armystudyguide.com [6], which serve largely as advertising platforms for for-profit colleges, were misleading to veterans returning from Iraq and Afghanistan…