I do like the chart.
I see some patterns emerging.
David has 3 jumps, each of which would seem to be the result of successful campaigns - but in between, the increase is almost flat. I imagine he has had to work hard for those jumps, but I would wonder if he is going to run out of audiences - or defeat his purpose by excessive pestering.
Nilu has a more regular pattern, cycling every day. The variance in voting rates indicates to me that she has a stronger support base located in adjacent time zones. (I would be interested to see whether these voting cycles continue with the same magnitude over the weekend.)
Carlos has a similar daily pattern, but the variance is notably less. This suggests to me that his support is more global. He just needs more people.