Pressure is mounting on Clearwire from investors to consider DISH Network's $3.30-a-share bid for the wireless service provider or push Sprint Nextel to raise its $2.97-a-share offer. Taran Asset Management said it will file a complaint with federal regulators arguing that Sprint has undervalued Clearwire. Glenview Capital Management said it would vote its 28 million shares against the Sprint bid, and Mount Kellett Capital Management wrote Clearwire's board Wednesday demanding that it consider the DISH offer.