Tonight’s debate on CNN for the Democratic presidential hopefuls was a big step forward for the way campaigns are covered.  The producers deserve a lot of credit for the innovative format they introduced.  The videos they chose were terrific: authentic(-seeming, anyway) voices from ordinary voters speaking directly to candidates.  The final video, about “the candidate to your left,” was a brilliant parting shot.  The effect was at once to empower voters and to render more human the candidates.  I loved it.  Well done, CNN and YouTube/Google.