Everything in ggplot2 is blue

I?m working with a data frame called ?Koufax? (his lifetime pitching stats) in order to improve my ggplot2 skills.

I?ve worked with a variety of iterations of ken <- ggplot(koufax, aes(x = W, y = IPouts, color = SO)) + geom_bar(stat = "identity?)  but all the bars come up blue, even if I call... ken +   scale_fill_gradient(low = "red",high = "yellow?).

Has this happened to anyone?  I?m wondering if there?s a package that I need to load through a library call.

Ken
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