Today is the vice-presidential equinox — the longest day on the 2008 political calendar, or at least the most interminable one, the day before the major parties’ VP picks start dropping. Seldom have so many (present company included) fussed so much over a pair of decisions that will be effectively forgotten in the news cycle two weeks from now.

Everything is becoming much clearer now: Barack Obama has made his choice, and he will announce it tomorrow. Unless he texts and emails it before then; George Stephanopoulos thinks he’ll do it tonight. His choice will be Virginia Gov. Tim Kaine, unless it is Delaware Sen. Joe Biden or Kansas Gov. Kathleen Sebelius or the last-minute buzz boy, Texas Rep. Chet Edwards. It definitely won’t be Hillary Clinton, apparently, unless for some reason it turns out that it is Hillary Clinton.

McCain? He’s going to announce next Friday in Ohio, unless he does so somewhere else and/or on a different day. It’s unquestionably going to be Mitt Romney, just as surely as it was going to be Tim Pawlenty yesterday and Joe Lieberman or Tom Ridge the day before that.

Want more veep trail mix? USA Today roundup. Politico roundup.