why is the labour party leader Jeremy corbin so popular with the conservative party?

The GOP plan was to redefine "Fascism" as anything liberal. Since Hitler himself claimed he was saving Germany from the liberals' genocidal anti-white conspiracy, American conservatives were merely adopting themes directly from Mein Kampf. Overall this little plan was spoiled by the election of mixed race Obama, and it would have been too much a stretch to declare he was the Nazi Schwarzkommando.

But we can see that the GOP has gotten that message out to its base, mostly thanks to the tireless work of Jonah Goldberg and Glenn Beck to redefine "Fascism." Many other republicans suffering from Holocaust envy also rushed to wrap themselves in the memory of Ann Frank.