my guess is that it's something like this.
look. you said one thing. but, you have a history of doing something else. so, what are your actual positions. do you support the tpp? what will you actually do about health care?
no, i heard what you said. but i want to know what you'll actually do before i decide what to do.
two things.
1) he has to believe what she says. that's hard. so, she can't just tell him what he wants to hear. he'll know if she tries.
2) there has to be some kind of real upside. that's hard, too.
don't assume the outcome of this is predetermined. she doesn't see him as an insider. she's not likely to really open up - she's more like to see him, and everything about him, as a liability. and, if he can't get a straight answer, he won't endorse her.