[R] How to use tapply with more than one variables grouped

[noobmin]

interTable <-data.frame (Tapply ($ contb_receipt_amt date, list ($ cand_nm
date, $ contbr_st date), sum))

I got create a table with the sum total contribution (contb_receipt_amt) of
each presidential candidate (cand_nm) in each state (contbr_st). How could
from interTable create a table of  states where candidate 'Obama' has
received greater Contribution?

thanks



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