04/18/2012 02:31 pm ET Updated May 23, 2012

Julia Louis-Dreyfus Dishes On Researching For 'Veep' (VIDEO)

Actress Julia Louis-Dreyfus, of "Seinfeld" and "30 Rock" fame, spoke with Jon Stewart about preparing for new role as Vice President Selina Meyer, the lead of HBO's new show "Veep," to premiere this Sunday, April 22.

In the interview she reveals a secret from the Senate floor that she uncovered in researching for the role (hint: it involves chocolate), and the prank she played on Sen. Al Franken (D-Minn). She also examines the parallels between Washington D.C. and Hollywood, and explains why she chose this project.

Check out the video above for the full story, plus a sneak peak of Louis-Dreyfus in her new role.