I haven't looked specifically at WordPress, but it should be possible, at least within an iframe.
Not sure that mashups is what you are after however, the mashup is live, so if you include it in a WordPress blog, you will get an active object that displays the current status of the app, which might be completely different from when you wrote the post. Exporting the chart in a suitable format might be a better alternative, but of course that depends on what you are after.
Hope this helps
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