Does a person earning $10,000 per year pay the 1.5% or is there a minimum threshold?  If there isn't a minimum threshold then a poor person pays 1.5% on all of there income and Bob Gillam doesn't pay any state tax on several million dollars.  

Unfortunately this is a typical Walker plan.  Tax the poor and give a pass to the wealthy.  The dividend tax of over 50% hits a poor household significantly harder than a well off household.  If you want to "tax" the poor on all of their income then you need to tax the rich on all of their income as well.