I have always been a fan of the Marx Brothers and watch for revivals. On PBS, I have seen both An Evening with Groucho and Groucho: A Life in Review. In both cases, Groucho is portrayed by award winning actor Frank Ferrante. He was also nominated three times for the London’s Lawrence Olivier Award. I wrote about the two times I saw him (Paradise, CA and Florence, OR) in my blog and the link is below.
His performance schedule is here: www.eveningwithgroucho.com.
There are some sample clips of his performance and I would recommend seeing his show if he comes to an area near you.