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

[noobmin]

             AL  AR  CA  NY 
Doug    250 250 250  NA 
Jennifer  20 340 300 100 
Michele  250 500 250  60 
Obama    15  45 520 600 

My English is not very good, I'll try again. I want to list ALL states in
the country where Obama had greater contribution. The table above shows the
total contribution received by each candidate in a given state. To AL state
obama not received more than Doug. For the AR state he received no more than
others candidates. For the CA state he received a total of $ 520, which is
520>300>250>=250 and should be selected. In NY also had the largest
contribution, $ 600, 600>100>60 and should therefore be selected.

I want to make it to the N presidency candidates and M states of the
country. The table above is only an example.

Sorry again, for me it was clear. = ( 
Thanks



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