More of the YouTube campaign ... I've seen few campaigns as aggressive as the Bob Casey effort in the Pennsylvania Senate race when it comes to posting videos online.

Santorum's tightening things up. But here's the Casey campaign going after him hard on Social Security:

Of course, for this to be effective, a lot of senior citizens would have to be on YouTube. So, there are still some benefits to conventional media.

As always, send nominations to:

ryan-at-realclearpolitics.com