A fundraiser organized by Twin Cities radio stations brought a flood of donations this morning in Minneapolis. More than 20 semi-trailer trucks filled with soap, towels and other goods are headed for people in the Red River Valley affected by floodwaters. Organizers estimate money raised from the event will top half a million dollars. The money will be split by the American Red Cross and the Salvation Army. Minnesota Public Radio's Dan Olson has more. tape . . . sfx 9:00 help you unload? With the sun just peeking over the Minneapolis skyline organizers of the fundraiser got a hint of what they had created. A stream of vehicles grew into two lanes of traffic with volunteers racing to un