how could Marbury establish judicial review if it was already in the Constitution? hint, IT COULDN'T!!!!!!!
now, here's some FACTS for you.
1. Marbury is, in part, a usurped power. If it was already a prescribed power, then it wouldn't have established judicial review.
2. If one needs to hold on to Marbury as the courts are the final arbiter of the Constitution, then how is it that we the people can amend it?
3. the other part of Marbury that people, like you, have to ignore is the part where it says that any law repugnant to the Constitution is null and void..........but how does that work? Can the people determine whats null and void and just ignore an unconstitutional law? try that and tell me how it works for you.
bottom line, Marbury is a usurped power. The courts took away the peoples power to determine what is and isn't Constitutional and made you a stupider person for it.