Capital One's blockbuster takeover proposal for Discover Financial includes a 1.38billionbreakupfeeifDiscoverdecidestogowithanotherbuyer,butnosuchfeeifU.S.regulatorskillthedeal,peoplewithknowledgeofthemattertoldCNBC.CapitalOnesaidlateMondayithadanagreementtopurchaserivalcreditcardplayerDiscoverinanall−stocktransactionvaluedat35.3 billion.While Discover can't actively solicit alternative offers, it can entertain proposals from other deep-pocketed bidders b ...