A recently-republished piece of evidence suggests that they did.
The Constitution’s Origination Clause requires that “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.” Because the final version of Obamacare imposed a variety of taxes, it unquestionably was a “Bill for raising Revenue.”
Obamacare’s taxes, appropriations, and health-care regulations did not exist in the House-passed version of H.R. 3590. That incarnation of the bill was only a few pages long and was limited to making minor adjustments to the Internal Revenue Code irrelevant to health care. Under the guise of amendment, the Senate gutted the original language and substituted over 2000 pages of Obamacare.
Some writers argue that complete substitutions were not considered valid amendments during the Founding Era, while others contend that they were. Last year, I undertook a wide-ranging investigation into the subject that will be published within the next few weeks by the Harvard Journal of Law and Public Policy.