Republican presidential candidates Mitt Romney and Fred Thompson haven't yet agreed to participate in the CNN/YouTube debate planned for November 28, the Trail reports. It's a surprising reticence, the TechPresident blog notes, because both campaigns have embraced Web video and YouTube in the past. Romney's YouTube profile hosts 357 videos, including this recent one, a response to Iranian president Mahmoud Ahmadinejad's speech at Columbia University. Perhaps the candidates are not avoiding YouTube as much as they're avoiding CNN. After all, Romney and Thompson are also not going to tomorrow's PBS debate in Baltimore, Md. We're thinking about sending an intern to interview the handful of second-tier candidates who do show up.