It is Mr. Sanders’s footprint in Iowa – that most critical of early states – where that expansion matters most.

Support for Mr. Sanders has surged around the country and he has drawn crowds that are the envy of other candidates. But it is Mr. Sanders’s footprint in Iowa – that most critical of early states – where that expansion matters most.

A new Des Moines Register poll shows that Mr. Sanders now trails Hillary Rodham Clinton the Democratic front-runner by only seven points in Iowa – where he will return for another campaign sweep on Thursday.

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Source: As Crowds for Bernie Sanders Grow, the Biggest Impact Comes in Iowa – The New York Times