Auto-bailout

You've heard that Republican Senators are blocking the Detroit bailout. Out of a principle of no government interference in the free market... or because these are Southern Senators, whose states host foreign-owned auto plants with no unions and lower pay? (And particularly, less accumulated pension obligations.)
http://electoral-vote.com/evp2008/Pres/Maps/Dec14.html
http://www.washingtonpost.com/wp-dyn/content/article/2008/12/13/AR2008121302207.html