One interesting note about the oft-cited Reschovsky study that says Wisconsin ranks 23rd in the country in general revenue per $1000/personal income. If, as seems to be the case, he is using the rankings for general state and local revenue from this 2005 Legislative Fiscal Bureau report, the numbers apparently use federal revenue. This lowers Wisconsin's ranking because we don't do too well at the federal trough. When you consider general revenue from our "own sources," we actually rank 15th.
More significantly, it is not at all clear to me that the more pertinent measurement is not taxes, rather than general revenue. When you limit the query to state and local taxes, we are 6th or 13% above average. In the face of this , opponents of the amendment want to change the subject to general revenue from all sources. But there is a difference between a tax and most forms of fee. The latter is compulsory while the former may not be to the extent that one can avoid using a particular state service. A fee is not always just a tax by another name.
All this and other types of wonky goodness can be found in this 2005 Legislative Fiscal Bureau report.
h/t: Seth Zlochota