slightly OTT but it is amazing how the song can also be applied to current day politics
Bush - senator son fortunate enough not having to serve

The lyrics are relatively straightforward. IMHO they concern the social devide of the priveliged [rich and politically well acquainted] and how CCR members are comparatively comparatively unpriveliged.
This is very applicable to the Vietnam conflict as the most social disadvantaged were sent to keep rich and influential citizens content. [Incidentally a lot of the poorer classes were black adding a racist edge to the issue].