Was Senate Oil Subsidy Bill Unconstitutional?

On Tuesday, Senate Republicans blocked a vote on legislation to repeal $2 billion in tax breaks for the five largest oil companies. Even had the bill passed, it would not have had much effect, however. Equivalent legislation is unlikely to move in the House. More importantly, as TPM reports, passage of the bill would likely have been unconstitutional, as revenue-raising measures are required to originate in the House.