Many low income people are in fact stay at home parents because the cost of daycare is so high that their salary if they went to work would not cover it.
"Making day care free, while offering nothing to stay-at-home parents, appeals to the educated, urban, affluent voters who have come to make up the Democratic base, but not to the electorate at large," Marc Novicoff argues:
bit.ly
The Problem With Democrats' Favorite Policy Proposal
Universal child care appeals to the party's cosmopolitan base—but not to most of the country.