You might not think that public money should be used to build a new stadium for the Minnesota Vikings. But there’s little doubt the Metrodome has seen better days. The stadium first opened in 1982, as a state-of-the-art facility that would keep the Twins and Vikings out of the cold. After staid domes fell out of favor, the Twins left for fresh air back after the 2009 season; they now play at Target Field. Football is a more acceptable indoor sport. But not at the Metrodome, especially after the roof collapsed under a snowstorm in 2010.