[Mr. K]

Why didn't the attorneys against Obamacare also argue that the law was never constitutionally passed in the first place, since it was done by reconciliation

[GreenLanternCorps]

Because the courts can’t judge the rules of the rules of the House and Senate. The House and Senate of the time considered the bill passed. The fact that the rules were twisted is outside the jurisdiction of the courts. The Constitution gives each house of the Congress sole jurisdiction over it’s own rules.