I have wondered about this for some time, and according to Josh Marshall, here it is: "A couple months ago, in passing, I noted that the Bush administration had been leaning heavily on the Pakistanis to produce some high-value al Qaida bad-guys -- bin Laden? Mullah Omar? Zawahiri? -- at the end of July, nicely timed to knock the Democratic convention seriously off-stride, and certainly, if at all possible, before the November election."