Could use some recommendations about how to master my songs

  I recently made several Pro-Obama music videos which combined recordings from Sonar Cakewalk Producer XI along with 3d animations and a combination of stock background videos and still images. On many of my songs, I found myself having to sacrifice what I felt was the best musicality of the initial mix to get a clearer final result where the lyrics could be heard more easily. I have a decent ear but I'm not a singer as will become readily apparent :) (though on one of the songs, Is It to Late, a friend from a local bluegrass band did the lead vocals). Since my voice isn't that great, I ended up doing multiple tracks and layering them together with some reverb to create a thicker sound which I found more appealing. But a couple of people who listened / watched and gave me their feedback said this ended up making things too muddy for the lyrics to be readily understood. So I was hoping some folks in the Cakewalk community could take a listen and give me some general or specific recommendations as to how I might improve the clarity without losing the musical benefit of multiple tracks and some reverb. A final note - these are political videos made from a unabashedly progressive/liberal point of view, so if that goes against your way of thinking, you may want to just skip over this post. (I'm happy to hear feedback on the social and political content of the songs as well, but it would probably be best to post that in the comments section on YouTube while restricting comments here to the technical advice about the audio side of things) Thanks in advance for any help. Here are links to the 4 songs as I currently have them posted. The first, Jim Crow, is on the new voting laws http://youtu.be/LnnL_Lk1-zc The second, Is it Too Late? addresses global warming: http://youtu.be/AeJz7NkHAoU The third, Where Have all the Angels Gone? - http://youtu.be/uQSLhrvIslY addresses what I see as the decidedly un-angelic behavior of the hard right. And the fourth, Mittnochio, http://youtu.be/EPXbbwknGpc which deals with what I saw as a lack of integrity from Romney's campaign in specific, and the right wind - note, “I’ve Got No Strings” is in the Public Domain (in contrast to the vast majority of old Disney songs), so my re-write doesn't trample anyone's copyright)

 Thanks foxwolfen. One of my problems was probably that I didn't choose a specific track as my main one and turn the others lower in dB - so I'm sure I've run into the problem of tracks 'competing' with one another for dominance in essence. And I didn't play with panning at all. I'll give that a try, turning 'support' tracks lower and panning them wide. In terms of compression, can I just use Boost to compress and adjust vol on the Master - or is compression best done on a per track basis first, and then Boosting at end if desired? Finally, do you have any advice on using reverb, which I thought made things sound better musically, but seemed to give some people a hard time understanding the lyrics? Thanks.

some great advice from Shad here Mosk. Get the mix right first and the mastering should be a breeze. Also, leave yourself some room in the mix for mastering.

Foxwolfen - Appreciate all the advice. I'm no longer operating under any time constraints, so I can now go back in a calm manner and try to apply the techniques you mentioned. Thanks again.