Two media-tracking sources say Mitt Romney's campaign has started reserving TV time in Pennsylvania for the final two days of the campaign, including Election Day. The initial placements come as the pro-Romney super PAC Restore Our Future is buying over $2 million in time there, and as Crossroads is also going up with a buy over $600,000. The Obama campaign, forced to expend resources there, has responded with a defensive buy of over $600,000. The Romney buy is intended to signal the campaign considers the state, which Republicans have made plays for in past presidential cycles but went for Democrats...