Rahal Letterman Racing, which won the 2004 Indianapolis 500 and brought Danica Patrick to the IndyCar Series, needs a primary sponsor to compete in the 2009 IndyCar Series. “Everybody knows about what’s going on in this economy, and things look pretty grim,“ team co-owner Bobby Rahal said today. “But we do have some sponsorship on board and what we’re still looking for is a primary sponsor.