Think again. As usual, Krugman writes a partisan screed complete with Krugman logic (an oxymoron):
Premise#1: "Regime Uncertainty" has no effect, since business investors only want to know if the economy will be strong before they invest;So, there it is.
Premise #2: Everyone knows that if the government spends a lot of money via printing and borrowing, the economy automatically will be strong;
Conclusion: Since Republicans have not supported everything President Obama has done, they are responsible for creating "uncertainty," even though "uncertainty" really has no effect. But we should blame Republicans, anyway, because they don't support Obama's Jobs Act, which everyone knows would bring back prosperity because Krugman says so.