evidence: In swing-state Wisconsin, new districts threaten the GOP hold on the Legislature [...] The GOP used its majorities to shift Wisconsin's politics to the right. When Republican Scott Walker was in the governor's office, they famously passed laws that weakened unions in a state with deep ties to organized labor. [...] Regardless of the outcome, there's already been a political sea change in Wisconsin, a state where the race for president is seemingly always up for grabs, and now the state Legislature is, too.