Aitkin Democratic U.S.Senator Paul Wellstone finished the two-day Minnesota leg of his nationwide poverty tour. Earlier this week, he toured poverty stricken neighborhoods of south Minneapolis and then it was off to Aitkin County, where Wellstone says poverty might be more HIDDEN but is no less severe. Minnesota Public Radio's Karen-Louise Boothe travelled with Wellstone, and has this report. In Minnesota, those who live their lives on the social and economic edge can sometimes escape the gaze of community leaders, elected officials...and even neighbors. The invisibility of rural poverty is perhaps partly due to the fact that when SOME think of poverty...the mind's eye is averted to the depression era imagery captured by photographer, dorthea lange. The gaunt faces that haunt her black and white stills are what we of