Charts are not predicting the future ... and NZX charts are certainly not predicting the outcome of the US elections. Having said that ... charts can obviously capture what outcome people predict at a certain point in time. If we assume these people are right, than here you have it - do some NZX charting and you know how the US will vote.
But now I am wondering why they go to these lengths and expenses anyway. It might be sufficient for the US to just set the election date and chart the NZX to pick the president accordingly. Up trend - pick Clinton, downtrend - pick Trump.
Obviously - just kidding.