Vangaurd 1099 footnote re U.S govt obligation percentage

Three questions:

1.  Can I just multiply the percentage detailed in the VMFXX footnote against against the total ordinary dividends to determine the dollar amount that is tax exempt in Mass?

2.  This percentage appears to include both US securities and "other US government obligations"?  Does that matter?  I'm not sure what other US obligations includes.  I did check and the repo's are not included in this percentage.

3.  There is nothing in box 12 of the 1099-DIV because this is all taxable federally.  Where in turbotax do I make the adjustment in the state form?