Whatever my mistrust on Congress but for Nuclear issue I trust MM Singh more than parliamentarians who can be bribed for asking petty questions. Or those MP's who are involved in human traficcking or Say people like Babloo Srivastava / Shabudin etc. etc
Our Indian parliament is yet to get serious players who match the level of MM Singh.
Moreover Our team negotiating with US on 123 agreement was of competent people, we should trust them.
Also note that India is not a baby that US can bully us or make us bonded labour.
Also US is not a headmaster we should be afraid off or refer our problems to.
We are a mature country, quite capable of running on our two feet.
Regarding CPI, they will be indeed playing negative role if they use Nuclear deal as an issue to break further progress in this area.
If Russia was strong enough to help India in Nuclear issues than there was no need to go in for USA. But Russia has not given us any creditable technology in this area.