What is liberal education? How can colleges support it? And how can they attract more students to pursue it? At a conference on such questions at Ursinus College, outside Philadelphia, the vice president for enrollment at Grinnell College, a far wealthier liberal arts institution in Iowa, shared the pitch he currently offers students and parents. “I haven’t even done this for the Grinnell faculty,” Joseph Bagnoli Jr. said Friday to the audience of professors and others. “So it’s a little daunting to do this in front of liberal arts experts … I’d love to hear your feedback, in the interest…