Transcript for Sen. Claire McCaskill on Hillary Clinton's Presidential Campaign
And joining us now, democratic senator Claire Mccaskill, who was one of the first to endorse Hillary Clinton. Senator Mccaskill, we just heard Jon Karl say there might be two hearings right in the middle of a campaign, how does Clinton deal with that? Well, first of all, I think most Americans understand that this has turned into a political exercise, benghazi has had more hearings, more documents produced, more investigative effort than the entire Iraq war, and at this point, it's pretty clear that she implemented all of the recommendations of an independent review, she's answered all of the questions and, so, I think they're really getting into dangerous territory, where it becomes blatantly obvious that this is just about politics and not about policy. Let me turn to what democratic strategists are saying, they don't want this to be a coronation, a Bloomberg poll saying 72 of democrats and independents say Hillary facing serious competition would be a good thing. You have said that you don't think she needs a challenger. Well, first of all, I think it's about who's most qualified to be a champion for working families. This is what this election is about. It's not about personalities or what someone looks like. It's about policy and I think what she's shown this week is she wants to go out, one-on-one, and make sure she is listening to the American people about their fears and frustrations. I think the way she's going about this campaign shows, she's not interested in the coronation, either. But she doesn't need a serious challenger? The bottom line is, she's the most qualified. Anyone can challenge Hillary Clinton if they would like to, the reason they're not challenging her is her qualifications. Thousands on the republican side because it's clear they're trying to read cliff notes. You endorsed president Obama in 2008, if Hillary Clinton wasn't the right person to be president then, why is she the right person to be president now? That's a tough choice. I'm glad that I don't have a tough choice this time. I don't think it will be a hard choice for America. This is a woman who's tested, who has a strong resume of accomplishments in every important job she's had, she doesn't need to get briefed about the complicated world that we live in. The reason this is not hard is because of who she is in this country's history. Marco Rubio, the republicans of course, announced his candidacy this week, frames it as a generational choice, let's listen. Now, just yesterday, a leader from yesterday, began a campaign for president by promising to take us back to yesterday. Your reaction to that, senator? Listen, there's -- if you look at Marco Rubio's record, he took a courageous stand on immigration reform and we passed a comprehensive bill in the senate, the minute his party's base started on him, he folded like a cheap shotgun, that's old politics. That's not what we need right now. That is the stalest trick in the book. So, I don't think that he necessarily represents some generational change. It sounds like to me old-style politics. Okay, thank you very much, senator Mccaskill.
This transcript has been automatically generated and may not be 100% accurate.