Dan Osborn, the independent Nebraska Senate candidate who presents himself as a centrist, has two longtime Democratic Party operatives serving as treasurers for both his campaign and a "conservative" political committee that the campaign has launched to reach voters in the deep-red state. Osborn, whose campaign website bills him as a "lifelong Independent," launched his campaign Tuesday to unseat Republican Sen. Pete Ricketts, just months after losing to Republican Sen. Deb Fischer. In addition