The following video is from Tuesday's Investor Beat, in which host Alison Southwick and Motley Fool analysts David Hanson and Mike Olsen dissect the hardest-hitting investing stories of the day.

The federal government's online insurance exchange, the centerpiece of the Affordable Care Act, launched today at www.healthcare.gov. In our lead story on Investor Beat, Mike and David share the stocks they think will benefit from Obamacare.

Also, the guys discuss four stocks making big moves today. Merck cuts 8,500 jobs. Zillow keeps killing it. J.C. Penney sees a dead-cat bounce. And Walker & Dunlop takes yet another hit.

Finally, David and Mike explain why they're keeping a close watch on shares of Panera Bread and Express Scripts.

This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.