The Pac-12 may need to commit to conference expansion first before achieving its compensation target in a new media rights deal, sources with knowledge of the situation tell CBS Sports. In an effort to return to 12 members following the departures of USC and UCLA, the Pac-12 has focused its efforts on evaluating San Diego State and SMU. Pac-12 commissioner Georgia Kliavkoff has already toured San Diego State, CBS Sports previously learned. He is planning to visit SMU on Wednesday, according to Brett McMurphy. The Pac-12’s next media rights deal will be heavily reliant on a digital streaming partner. Significantly more than half of each season’s Pac-12 football games will…