From Article I – Section 7 of the U.S. Constitution:
“All bills for raising Revenue shall originate in the House of Representatives; but the Senate may propose or concur with Amendments as on other Bills.”
The health care bill the Democratic Party leadership is trying to pass (by vote or otherwise) is the Senate bill. This bill is apparently not a product of the reconciliation process since nothing was done to try to reconcile it with the House bill. It is, I think, a revenue bill originating in the Senate. If this is the case, it is unconstitutional.
This would be in addition to its generally unconstitutional content.