[VladRussian]

>...models of the big bang that have been confirmed by experiment ...

to put it mildly, it is a very overreaching statement.

>Second, dark matter doesn't seem to behave the same way that baryonic matter behaves (normal matter clumps, dark matter doesn't appear to do so).

double whammy - we couldn't observe dark matter and we couldn't observe its clumps.

Or consider it another way - while it supposedly have gravitational attraction, and have no other strong interactions known, we somehow should suppose that its non-clumping, ie. gaseous/cloudy/spread-around state is still a normal thing.

[InclinedPlane]

http://en.wikipedia.org/wiki/Baryon_acoustic_oscillations

http://en.wikipedia.org/wiki/Cosmic_microwave_background_rad...

http://en.wikipedia.org/wiki/Dark_matter#Galaxy_clusters_and...