The first paragraph of Article I Section 7 of the US Constitution explicitly states: 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.
When the legality of Obamacare (ACA) was challenged by those who considered the bill unconstitutional, SCOTUS declared that Obamacare was a tax and indeed was constitutional. However, I never heard Article 7, Section 1 of the US Constitution mentioned, by any Democrats and Obamacare enthusiasts. The reason could be that the Affordable Care Act originated in the Senate instead of the House of Representatives, making it illegal.
As soon as SCOTUS declared it a tax, it would have been necessary for the House to take up the issue and vote on it and send it to the Senate. As most of us know, that didn't happen. So why then doesn't the Republican Party attack the bill using this legal strategy. A tax is clearly a form of raising revenue and the Constitution clearly states: 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.
If then, the US Senate sets a precedent of being able to raise revenue, what part of the US Constitution will they attempt to subvert next? If the Obama Administration wants to pass the Affordable Care Act so badly and "have the citizens accept it," they should make it legally correct.