The CWI isn't doing independent work everywhere, but adopt a flexible approach according to the circumstances. For example we work inside the SP (Netherlands), Die Linke (Germany), SYRIZA (Greece), PSUV (Venezuela), PSOL (Brazil), NPA (France), to name a few. And where we do open work, mostly due to the lack of a workers party, we call for the broadest possible unity. In the UK we participate in No2EU and in Belgium we have a united election list with, among others, the LCR (USFI), to name just two examples in the Euro elections.
So, what ultra-leftism?