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presidential nomination is all but over but we will get a taste tonight of whether the tea party will finally show some 2012 strength and a test of how important the culture wars will be in a year defined mostly today by economic challenges. our first stop indiana where 80-year-old senator richard lugar, leading republican voice on foreign policy is asking for one more term but facing a tea party and conservative revolt, revolts lugar s critics prove the senator last touch with the folks back home. dana bash is at lugar headquarters in indianapolis. you had a chance to talk with senate lugar a bit earlier today. let s listen to some of the exchange. reporter: you re 80 years old. you ve had by all accounts a stellar career. why did you decide to take on this fight within your own party rather than just say it s been great, time to go? well, first of all, because i believe that i have a unique opportunity to serve my country with regard to arms control, with regard t ....