On http://www.nefkom.net/z-bau/celestia you can now find a 4k texture of the political world of 2003. Sorry, but I don't remember where I got the original data from - a public cia website perhaps - but I'm quite not shure.
And a reminder that if you want to overlay the political borders on an existing texture, I have a virtual overlay texture at: http://www.lepp.cornell.edu/~seb/celestia/hutchison/borders.html. The virtual format allows you to zoom in to high resolution in areas where there is small detail - to see small countries like Monaco and San Marino, or to look at complex borders like those surrounding the various Central Asian enclaves.