The Sunnis are upset at the assumed election results.
I guess when you assume you have more than half the population of Iraq, getting maybe twenty percent of the vote is quite a shock.
Rather than running a new election, somebody needs to sit down with the Sunni leaders and explain the math to them--you guys have maybe 20% of the population. Deal with it.
As long as this is all chest thumping and street marches, I'm not too worried.