TOPEKA, Kan. (AP) — Republican presidential candidate Rick Santorum hoped to lock down a victory in Kansas' GOP caucuses with two rallies Friday but faced grumbling from tea party activists for skipping their big rally in the state's largest city................. Some tea party members were frustrated that Santorum wouldn't attend their rally. They spent $25,000 to rent the Century II arena in downtown Topeka and expected 1,000 to 3,000 people to attend. "It seems like it is counterproductive to show up for an event that is going to have 300 people in an airplane hangar instead (of) 3,000 people in...