While this is a second media stumble in a month, I don't think this says much about Bennett's competency as a leader. Say what you like about her, regular slots on Question Time and various other politics programmes have done little to stymie the rapid growth in members and opinion poll scorings.
Does today's trainwreck matter? Not really. Like many others I winced by way through the LBC interview, but I'm in that tiny minority who pay attention to the comings and goings of campaigns and Westminster whimsies. Others not so engaged might have thought it a bit stilted and awkward, but had forgotten about it within five minutes of broadcast. The kids are unlikely to play excerpts to each other in the playground tomorrow. Furthermore, Bennett explains it all in terms of having a "mind blank". That happens sometimes, as the poor souls forced to listen to me drone on at work will tell you. However, what was so painfully obvious was Bennett did not have a handle on her brief. Whether that's because she was having a bad day, or her crib notes were poor, or because the Greens have yet to do proper costings on their pledges (which, as we know, will be in the manifesto), it looked very bad. Yet when the campaign cranks up all of his will be but a footnote. Journos are a predictable bunch and will try catching her out again in future. As we speak, I bet she and her team of friends and advisers are looking at ways of properly polishing up.
The second question, of course, is will it have any discernible impact on Green support. We will find out later in the week. I suspect not, though. This is not a Gillian Duffy moment, nor "the day the Green Party surge hit a cliff", as Adam Bienkov put it.
It's long been established in the political science literature that the growth of Green parties are related to long-run shifts in class structures and values systems in affluent societies. As such the core Green voter tends to be "post-materialist". Their political participation is value rather than interest-oriented. In Germany the Greens were able to intersect with this growing constituency and build a substantial party with some serious electoral clout.
In Britain, the same broad strata also emerged but they tended to be ranged across the Labour Party, a section of which has always been an alliance between the labour movement and professional associations, and from the 80s onwards the SDP/Liberals and latterly the Liberal Democrats. With the collapse of the latter and the "under-promising" of Labour, the Greens here have finally been able to make inroads into this layer. Because this grouping has rejected the interest-based game of conventional politics in favour of something seemingly more radical, committed and would-be Green voters are unlikely to be phased by Bennett's lack of polish. Indeed, it might elicit sympathy and help secure that vote intention.
This then is but a blip. A bit of raucous fun for partisan saddoes, a bit of a face palm for some Green activists. In the grand scheme it will matter not a jot.