I'm not sure why a Senator from NY and a congresswoman from CA, states with high property values (some owned by wealthy people, and some not) are phonies for fighting for the rights of their constituents.
Bernie is right however that increased SALT deductions in mostly blue states, will be exploited by and talking pointed by the Repubs, the traditional party of the down-trodden and the party that siphoned off $2 trillion in tax savings (and some provided by reduced SALT deducts) for the top 1% and the largest corporations.