CHICAGO — It will make you stronger. It will give you peace of mind and make you feel like a winner. Health insurance is what the country is talking about, so don't be left out. Sound like a sales pitch? Get ready for more. As President Obama's health care law moves from theory to reality in coming months, its success may hinge on whether the best minds in advertising can reach one of the hardest-to-find parts of the population: people without health coverage. The campaign won't come cheap: The total amount to be spent nationally on publicity, marketing and advertising will be at least $684 million, according to data The Associated Press compiled from federal and state sources.