Why did 2 judges rule that obamacare is constitutional and 12 dimissed challenges to obamacare?

Up-front know I am all for the new health-care reform. USA is behind on revising our all for the insurance, health care institutions and will finally have a system that is pro-patients' and pro-prehealth conditions. Know that alot of companies, health care institutions, doctors, and individuals are against the new reform. They are self centered and have some personal agenda against it. Most peoples companies they work for will have to pay the majority of the cost. Those less fortunate will have federal options of insurance.