Money-losing Clearwire (CLWR) on Wednesday asked Sprint Nextel (S) for cash, a move that will hike Sprint's stake in Clearwire as it jostles for control of Clearwire with Dish Network (DISH). Clearwire said it will draw on $80 million in financing from Sprint in March. Sprint owns just over half of Clearwire and has offered to buy the rest of the company, aiming to add radio spectrum for its buildout of a 4G LTE wireless broadband network, as IBD