MADISON, Wis. — As the Obama administration tightens the noose around the necks of coal, power plants and mining, one Wisconsin state senator is worried the next victim could be a proposed iron-ore mine just south of Lake Superior. Gogebic Taconite is proposing building a $1.5-billion open pit mine in the Penokee hills In Iron and Ashland counties, near the small community of Mellen. An economic impact report projects the mine could create thousands of jobs in job-famished northern Wisconsin and beyond. State Sen. Tom Tiffany, who shepherded a bill that streamlined state mining regulations that could pave the way...