Frothingham general rule:  no standing b/c fails prudential
requirement of no generalized grievances
i)    not knowing where CIA money is spent is generalized grievance
Richardson
ii)    earmarking exception:  standing if tax $ you paid can be
traced into appropriation (use) for unC’al ends (Steward)
iii)    note:  if you pay a tax that you claim is invalid, you have
standing b/c you have actually paid the tax; this is concrete and
individualized.