It is generally assumed that the particle of dark matter has to be electrically neutral, so that it doesn't interact with the electromagnetic field and stays "dark".
But cannot the lightest superpartner or WIMP or dark matter particle be charged, e.g. a chargino? I think that in order to neutralize, such a chargino would create bound states with electrons or positrons which would behave as "very heavy" (150 times heavier, for example) hydrogen atoms whose spectrum would be otherwise indistinguishable from the hydrogen spectrum, including the -13.6 electronvolts of the ground state (up to tiny differences from the reduced mass' not being the electron mass).
We would still see some "hydrogen" in the galaxy but the actual mass that this "hydrogen" carries would be e.g. 150 times higher, so this excessively heavy atoms could account for the extra mass needed as dark matter. Does this scenario contradict some facts?