The rest of Germany is CDU, but not Bavaria:
More on the CDU:
http://en.wikipedia.org/wiki/Christian_Democratic_Union_(Germany)
More on the CSU:
http://en.wikipedia.org/wiki/Christian_Social_Union_of_BavariaWhile the article point out the post-WWII difference between the parties, one important factor is Bavaria was technically an Independent "nation" till 1918 when WWI ended. The Bavarian Army was technically a different army with different uniforms then the rest of the Germany army prior to 1919 (Hitler technically joined the Bavarian Army with the permission of the King of Bavaria rather then serve in his native Austrian Army, notice the King of Bavaria had to give him permission to serve NOT the Kaiser, who had that right in the rest of Germany). Bavaria never liked losing what was left of its independence in 1918, but was a strong base for Nazi support prior to WWII. Thus the tendency to be different, if possible, from the rest of Germany. In many ways Bavaria had been closer to Austria then Prussia before Unification in 1866 and retains those connections.
More on the Bavarian Army:
http://home.att.net/~david.danner/militaria/bavaria.htmGlobal Security site on the Bavarian Army, but ignores anything post 1870:
http://www.globalsecurity.org/military/world/europe/de-kaiserliche-heer-bavaria.htmMore on Bavaria itself, even keeping a separate
http://en.wikipedia.org/wiki/BavariaThe Bavarian Independence party (yes one exists, but most active in the 1950s):
http://en.wikipedia.org/wiki/Bavaria_Party