matplotlib pylab question - offset bar graph labels

I've got a function that builds a bar graph.  We are 95% happy with
it, but the x-axis tick labels are a little bit skewed to the right.
Anyone know how to skew the labels over by 10 or 20 pixels?  Here's
the code that generates my xticks:

xticks(range(len(builds)), users, rotation=30)
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