The U.S. Senate likely will confirm Janet Yellen on Monday as the next head of the Federal Reserve. Congress reconvenes this week to start 2014, a critical midterm election year, as extension of emergency unemployment benefits and hiking the federal minimum wage are key debates that could grip legislators for the year. The discussions on these issues may prove pivotal to close elections in battleground states, which become key in determining the balance of power in Washington by the year's end.

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