With serious videos we might be preaching to the choir and have greater chances of getting our supporters further involved, while with lighter, more entertaining pieces we could to reach out to new audiences.
“Branding in online video is subject to VOD (Video on Demand), but there's a
catch. Political branding can't be entertaining because a candidate won't be
taken seriously. Also, political branding is much more about reinforcing an
image than it is about winning converts to a new product or service.
[…]
Entertainment VOD doesn't have this constraint because people seek out
entertainment and, even when VOD based […] Not so political VOD. Here the whole
point is to get the visitor reafferent: highly involved! Vote! Contribute! Tell
your friends how good I am!”
Also, he mentions the value of online video to keep people on your site and its effect on branding.
“Time on your site means your brand is in front of your visitors and not your
competitors' brands.”