Bulls To Bears: The central bank is under pressure to revive an economy.

The plan the Fed is considered most likely to unveil Wednesday has been dubbed "Operation Twist" and dates to the early 1960s. The Fed used a similar program then to "twist" long-term rates lower relative to short-term rates. Fed Chairman Ben Bernanke is expected to advocate the move despite criticism from within the Fed and from Republican lawmakers and presidential candidates. The Federal Reserve is running out of options to try to boost a slumping economy and lower unemployment. So policymakers are expected to reach 50 years back into their playbook for their next move. Bernanke has also faced criticism from congressional Republicans and GOP presidential candidates. Some have argued that the Fed's $600 billion bond-buying program, which ended in June, weakened the value of the dollar against other currencies and contributed to a spike in oil and commodity prices. Texas Gov. Rick Perry, who is seeking the GOP nomination for president, went so far as to say Bernanke would be "almost treasonous" to launch more bond buying. Fed Chairman Ben Bernanke is expected to advocate the move despite criticism from within the Fed and from Republican lawmakers and presidential candidates.