What do Jay-Z, Jim Carrey, Jake Gyllenhaal and Sacramento comedian Mike E. Winfield have in common? They are all scheduled to appear this week on CBS's “Late Show With David Letterman.” "It was an AMAZING experience," Winfield said when asked to describe his recent appearance. Winfield is no stranger to performing his unique brand of standup on television. He’s been featured on Showtime’s “Comics Without Borders,” hosted by Russell Peters, “Comicview” on BET, “Comics Unleashed” with Byron Allen, “Last Comic Standing” on NBC and “Live at Gotham” on Comedy Central. Quite the resume for a man who, until recently was a grocery clerk working at the local supermarket chain. At AmericasComedy