Now in its 75th go-round, The Whitney Biennial is still the big kahuna, the show every American artist wants to be in and every art lover wants to see. This year the career-boosting show includes no Philadelphia artist. We had representation in 2002, 2004, 2006 and 2008 — so much for that trend. Instead, the curators went to Chicago, Oregon, Los Angeles and, of course, New York for the 55 artists, more than half of them women (a first) and many of them under the national radar.