Update | 10:48 AM ET -- Mystery Solved: Morning Joe Executive Producer Chris Licht has emailed me to say: "Mika was reading research emailed from a segment producer to her Blackberry: specifically, the Bloomberg News article re: Townsend says election is potential terrorism target."
Have a look at the screencap. It's Mika Brzezinski scrolling what looks to be her Blackberry as she poses a hostile question to Fran Townsend, President Bush's top White House adviser on terrorism and homeland security.
Townsend, who has announced that she's stepping down after four years in the Bush administration, appeared on today's "Morning Joe." After some conversation with Willie Geist, Mika Brzezinski took over, peppering Townsend with a series of challenging questions on everything from the failure to capture Bin Laden to waterboarding.
Mika appeared to have Blackberry in hand throughout. When it came to her last, and nastiest, question, she was busily scrolling it as she read off its screen.
View video here.