Cuts to big bill vex Democrats

President Biden’s signature piece of domestic legislation is going to be much smaller than initially envisioned — and that’s vexing Democrats who worry that vital proposals will be whittled down or erased entirely.

The final bill is likely to come in at around half the original $3.5 trillion projected, according to multiple reports. The huge sum being cleaved off the top line means that some cherished progressive priorities are sure to fall by the wayside.

Progressives have run into the unyielding math of the Senate, where two more-conservative Democrats, Sens. Joe...