One week before the caucuses, Iowa is effectively a tossup, as Bernie Sanders has taken a one-point edge over Hillary Clinton after trailing last month. That puts Sanders in position to potentially win both early states as he continues to hold a very large lead in New Hampshire. Clinton maintains her long-standing advantage in South Carolina in this latest round of the CBS News Battleground Tracker.







There is a big gap between the two on who better understands what voters are feeling, and to whom each would listen as president. In Iowa, 91 percent of Democratic voters believe Sanders would pick regular people over big donors. But a majority -- 57 percent -- of Democrats feel that Hillary Clinton would do what big donors want instead of what regular people want, if forced to choose.