Because saying that makes it sound like the republican base is poor people. Which is obviously rediculous but it fits the identity politics narrative of the left.
Pretty much this. Politically active liberals (including much of the media) hardly represent a majority of Democrats, but they MUCH prefer - by and large - to picture their fight as against a bunch of Stone Age rubes than against self-sufficient people who just think the Democrats' ideas are stupid.
And I've never understood quite why this is, considering that the 'guy with briefcase hustling someplace' demographic is a massive paper tiger in terms of knowing what they're talking about and having good ideas.
Is this really the prevailing attitude among Democrats though? I know this sort of talk is common among ostensibly left-leaning Very Serious Beltway pundits, but does your average Democratic campaigner - or, say, your local liberal/progressive opinion leader - really think in those terms? Maybe this is wishful thinking on my part, but I tend to believe that those people (who ultimately matter more than the pundits) are a lot more likely to still see Democrats as the party of "working families" and "the common man/woman".