Reuters) - Wisconsin's Republican Gov. Scott Walker said on Monday that absent senate Democrats have 24 hours to return and vote on a measure to reduce the power of public sector unions or the state will miss out on opportunity to refinance its debt. "Now they have one day to return to work before the state loses out on the chance to refinance debt, saving taxpayers $165 million this fiscal year," Walker's spokesman Cullen Werwie said in a statement. "Failure to return to work and cast their votes will lead to more painful and aggressive spending cuts in the very...