Intense budget negotiations in the divided 112th Congress, wherein Democrats resolved to fight Republican demands for decreased spending and no tax hikes, threatened to shut down the government in April 2011 and later spurred fears that the United States would default on its debt. Continuing tight budgets were felt at the state level, where public-sector unions, a key Democratic constituency, battled Republican efforts to limit their collective bargaining powers in order to save money and reduce union power. This led to sustained protests by public-sector employees and walkouts by sympathetic Democratic legislators in states like Wisconsin and Ohio. The 2011 "Occupy movement". a campaign on the left for more accountable economic leadership, failed to have the impact on Democratic Party leadership and policy that the Tea Party movement had on the Republicans. Its leadership proved ineffective and the Occupy movement fizzled out. However, echoes could be found in the presidential nomination campaign of Senator Bernie Sanders in 2015–2016.