  In this paper, we confront the predictions of the power law cardassian model
for the baryon power spectrum with the observations of the SDSS galaxy survey.
We show that they fit only for very unusual values of the cold dark matter or
baryon density parameters, the Hubble parameter or the spectral index of the
initial power spectrum. Moreover, the best-fit Cardassian models turn out to be
phantom models. If one wants to recover the usual values for these constants,
as quoted by the WMAP team, the power law Cardassian model turns out to be
indistinguishable from a LCDM model.
