As Democratic voters say their party needs to change and young voters grow more skeptical of traditional party politics, a crop of candidates in their 20s and 30s is stepping in to challenge older Democrats for their seats in Congress.

Last month’s national NBC News poll found a near-majority of voters see CEOs of large corporations as being too supportive of President Donald Trump, while about the same share of voters also said they think the news media is too critical of the presid…