TEXT: This Feb. 22, 2012 photo shows CNN's John King before the Republican presidential candidates debate in Mesa, Ariz. High-speed Internet services represent the fastest growing and most profitable line of business for cable companies. Last year, providing Internet access was 12 percent more profitable for Time Warner Cable than providing TV packages, despite taking in a third less revenue. Time Warner Cable has so far resisted Charter's overtures, but Charter has vowed to take the bid directly to shareholders if needed.