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Plotting the margins would seem even better, say Clinton margin +ve on right hand side and Obama on left. This would allow quick identification of who was more popular.

Jon Peltier

The only piece of chart junk I might add to your two sided bar charts is vertical gridlines at ±50%.

If you used a one-sided clustered bar chart, you could more readily compare the lengths of the Clinton and Obama bars. A little experimentation shows that this helps for comparisons where the two candidates are close (Wisconsin), but is completely worthless when they are far apart (Tennessee).

I've described my charting attempts here:

Jon Peltier

That URL came out wrong in my post. It should be:



One of my favorite graph types :-)

I'd only make one comment, which is that I think the cyan is a little too light to easily see, and perhaps I'd prefer a blue or magenta bar instead.

Or, since the bars are physically separate, why not have them be the same color and just label the sides "Clinton" and "Obama"? Different colors could then be used for some other dimension of information, if there was one.

Markus Koljonen

I'd also consider adding the magical 50% treshold (Could it be a background color instead of a vertical line?) as it is a visual piece of information that is lost in the transfer - as is the "others" white space, even with its failures.


If you want the 50% line so much, and also miss the "Others", it's probably time to give up on the two-sided bar graph altogether, and go back to the 100% stacked bar graph. That's my usual default for three series that add up to 100%, of which two far outweigh the third.


Great comments all! Derek's version is a nice alternative. There really is no need for any colors at all; I just need to put Obama and Clinton on the axis.


What might be a nice bit of extra value would be if we knew the numbers of voters in the cities, suburbs, and rures in WI and TN. Making the bar graphs into matrix graphs would add information about the urbanization of the two states, and the areas of the bars would sum to tell you who won the overall primary (at the moment you can't see who won in Tennessee because that's lost in the breakdown).

Jon Peltier

I've made some small changes and additions in a follow-up:


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