President Donald Trump has virtually erased the Democratic Party's long-standing advantage with middle-class voters, according to a series of new polls.Why It MattersFor decades, Democrats were widely regarded as the party of the middle class.

CNN chief data analyst Harry Enten reports on new polling data showing Republicans winning on the economy and how the party closed the gap with Democrats among middle-class voters. Enten said voters believe Republicans have a better economic plan by a 12-point margin.