(CNN) – President Barack Obama, hoping to pitch his signature health care law to younger Americans, will get some help from a cadre of Hollywood stars who have volunteered to help promote Obamacare's insurance exchanges that open on October 1.

At a meeting at the White House Monday, a group that included singer Jennifer Hudson and actors Kal Penn and Amy Poehler heard Obama extol the benefits his health care law offers young people, whose participation in the exchanges is seen as essential for their long-term viability.
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