TALLAHASSEE, Fla. (AP) - Labor unions and a taxpayer are challenging a proposed state constitutional amendment that would give an extra property tax break to some home buyers.   A Tallahassee judge has scheduled a hearing Thursday in the lawsuit seeking to remove Amendment 3 from Florida's November ballot.

It would give people who have not owned a home for at least eight years an added, temporary homestead exemption on primary residences purchased on or after Jan. 1, 2010.

The Florida AFL-CIO and Jacksonville resident Brian K. Doyle say the title and summary are flawed because they don't include that date and refer to "new homestead owners" and "a first-time homestead" despite the eight-year provision.