If it really was all Clinton's work - that Kerry and Obama merely finalized and then stole all the credit - there would be no article like this. http://www.huffingtonpost.com/entry/iran-us-relations-after-kerry-zarif_us_56a6a018e4b0b87beec5d157
Note that they worry EVEN if HRC becomes President - and her role and her public positions make it pretty clear why she could not have played the role Kerry did.
Here is why one expert though Kerry had a good relationship:
Yet even if a future Republican president decides to abide by the terms of the nuclear deal for practical reasons, its unlikely that any of the current GOP candidates would appoint a secretary of state who has Kerrys ability and inclination to work closely with his or her Iranian counterpart.
Parsi, who is in contact with Iranian diplomats, said they have complained that Kerry is too tough a negotiator, but have always spoken about him with respect. For the simple reason that he always spoke to them with respect, Parsi said.
That level of mutual respect is not guaranteed to continue even if a Democrat takes office in 2017. Former Secretary of State Hillary Clinton, the leading Democratic candidate, supports the nuclear deal but often describes it as an arrangement imposed by the U.S. on Iran, rather than as a deal unanimously agreed to by all parties.
I dont see Iran as our partner in implementing the agreement. I believe that Iran is the subject of the agreement, she told the Brookings Institution in September.
When it is clear you have no real respect - like the comments here show or the comments of "hunting down the Chinese" - how can you manage to find common ground. If she wins, she needs to avoid a mimi me as Secretary of State.