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

[noobmin]

The criteria is to list where Obama has a higher number of contributions. The
table shows the number of contribution that each presidential candidate
received in a state of the country.

The table shown is an example, the query should be generic to a database
with hundreds of candidates and dozens of states of the country. The
original base has 450 mb, in real database I'm don't know  how many contry
states Obama has more donations, but in sample is in CA and NA. Michelle
wins more contribution on AR....

Thanks



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