Well, if an ex-Clinton advisor says it, it must be true. Oh the statement is "may", so there's really no story here because you can never be wrong with a "may".
Paul Begala is as "Democratic insider" as you can get, and is also an insufferable talking head. The point of getting a message like this out there is to undermine public perception of the Trump/Vance ticket more than anything
In response to Newsweek's request for comment on Begala's prediction, Trump/Vance campaign spokesperson Steven Cheung said that "there's a reason Paul Beluga [sic] no longer gets paid for his political advice."
Lol
While Haley might have a broader appeal to undecided voters than Vance, her status as the last Republican to mount a primary challenge against Trump, when the former president often referred to her as "birdbrain," may make the scenario unlikely.
I understand what he gets out of it, I don't understand why someone at Newsweek decided to be his megaphone. There are plenty of functional stories about Vance's bad positions, hypocrisy, or poor favorability that do the same thing based on information rather than being a stenographer for someone without any real importance or special knowledge. If that's the story they wanted to write, they very easily could do it, instead they just summarized an already worthless interview.