 CHICAGO--BUSINESS WIRE--Kemper Corporation NYSE: KMPR announced today that AM Best has upgraded the Financial Strength Rating FSR for its propertycasualty subsidiaries and affiliated insurance companies to A Excellent from A- Excellent and the Long-Term Issuer Credit Ratings Long-Term ICR to a from a-. AM Best also upgraded the FSR of Kempers lifehealth subsidiaries to A Excellent from A- Excellent and the Long-Term ICRs to a from a-. In addition, AM Best has upgraded 