A winner here -- even if young adult turnout proves to be disappointing -- could be e-commerce insurance platform provider eHealth ( EHTH -3.59% ). The thing about young adults is they like choices, they like technology, and they like a company that's been around for a while. Unlike the Obamacare health exchanges, which are just magically going to pop into existence on Tuesday, eHealth has been around offering a private health insurance platform for more than a decade. If there's a potential winner here, it could be eHealth.