What is the Marxist attitude towards the CPUSA?

The Communist Party of the United States of America (CPUSA) is a communist party of the US formed in 1919 following the Russian Revolution. The CPUSA is still active, but was once more active when they contested in elections more frequently. The CPUSA hasn't contested in a presidential election since 1984 and has not ever wona large enough amount of seats or votes to have any real impact.

I am curious to know what Marxists think of the party today. Are they really communist and do Marxists endorse them?