More on that unfunded mandate the Mississippi Senate just passed

Sid Salter's got a blog post up that contains the text of a memo from George Lewis, head of the Mississippi Municipal League, that outlines the problems with the immigration legislation the Senate passed yesterday.  Here's an excerpt from the memo:

While there are numerous good sections of the bill, funding is pushed down to the local, city and county and law enforcement entities to implement as an UNFUNDED MANDATE by the state, with the exception of $20/day for incarceration. There are also large fines for elected officials for not fully implementing the state program with a open-ended ability for local citizens to take local officials to court.

What in the world are Sen. Joey Fillingane (R-Sumrall) and Lt. Gov. Phil Bryant thinking with this language? Aren't they supposed to be against creating unfunded mandates and causes of action against local governments?