WASHINGTON -- After years of pushing the Obama administration to issue an executive action granting protections to undocumented immigrants, advocacy groups are now gearing up for a dramatically different challenge: making sure that policy actually works. There is a vast difference between advocating for action and implementing it. And if the jump isn't made seamlessly, reform advocates worry, it could endanger the gains they have made and complicate prospects for future, further-reaching reforms. With that in mind, a number of groups are shifting resources and focus.