(a) The Congress finds that
(1) the States should have the primary responsibility for determining what forms of gambling may legally take place within their borders;
(2) the Federal Government should prevent interference by one State with the gambling policies of another, and should act to protect identifiable national interests; and
(3) in the limited area of interstate off-track wagering on horseraces, there is a need for Federal action to ensure States will continue to cooperate with one another in the acceptance of legal interstate wagers.