It’s R or D, Krugman writes. An imperial presidency or not.

Democrat capture of the House also is about subpoena power.

The current Congress has shown no inclination to investigate the Bush administration. Last year The Boston Globe offered an illuminating comparison: when Bill Clinton was president, the House took 140 hours of sworn testimony into whether Mr. Clinton had used the White House Christmas list to identify possible Democratic donors. But in 2004 and 2005, a House committee took only 12 hours of testimony on the abuses at Abu Ghraib.

If the Democrats take control, that will change — and voters should think very hard about whether they want that change. Those who think it’s a good idea to investigate, say, allegations of cronyism and corruption in Iraq contracting should be aware that any vote cast for a Republican makes Congressional investigations less likely. Those who believe that the administration should be left alone to do its job should be aware that any vote for a Democrat makes investigations more likely.