(state of VA lacks standing to challenge individual mandate provision in Patient Protection and Affordable Health Care Act (Act) of 2010; Liberty University cannot challenge Act before mandate provision becomes effective in 2014; no dissenting opinions filed; VA had argued that it had standing due to the Act conflicting with state law that protects VA citizens from the Act's individual mandate provision, but court disagreed and stated, "When a state brings suit seeking to protect individuals from a federal statute, it usurps this sovereign prerogative of the federal government and threatens the 'general supremacy of federal law'"; court did not address question of constitutionality of individual mandate).