A couple things, the GOP opposed Hillarycare back in the 90's so it had nothing specifically to do with Obama it had to do with the central government taking over 1/6 of the nation's GDP. This was never about opposing our new black president named Obama, it had to do with opposing government run health insurance. 
Secondly the majority in hte GOP never fully back Heritagecare and the mandate in Heritagecare was only for catastrophic insurance coverage, which was already included in the vast majority of existing insurance plans. 
Bottom line Obamacare did little of nothing in reforming actual healthcare, it's only purpose was to find ways to pay for the overcharging and waste in our healthcare system and drug prices.