So why would Republicans get blamed by a majority of Americans if the Sequester comes to fruition?
My theory is that it's because the Sequester is exactly what the Republican wingnuts have been screaming about every time there's a Democrat in the White House. Because it's large-scale spending cuts. And the Republicans are on record for wanting large-scale spending cuts ("shrinking government down to where we can drown it in Grover's bathtub", remember?).
It may also have a bit to do with a majority of Americans thinking the deficits can be fixed with a combination of spending cuts AND tax increases on the uber-rich, something that Obama is pitching as his alternative to the Sequester whereas the Republicans insist on cuts ONLY.
So that's my thought on the Sequestration Crisis of 2013. After this gets resolved, we should be ready for the Bad Budget Crisis of May 2013... then the Let's Force Obama To Veto a Crazy-Ass Bill and Impeach Him For It Crisis of July 2013... and then...