What makes an advocacy video effective is that it can relates to people, not just some high moral lessons, boring doctrinal lecture.
Here's a few points where this video gets me:
humor,
twit THAT,
'your senators... they don't even know how to use emails',
very very easy sharing options for multiple social networks and for emailing senators! ( you don't even have to search for your senator's email address);
and huge bonus point: Justin Long "on a mac or whatever kind of computers, regardless", and of course, wait till the very end...... "I love you" ---- how could you NOT be sold on that??!!
Therefore, please enjoy the video: