There will be trial balloons of various VP candidates every other day.
McCain will choose a conservative running mate if Obama is the nominee. He must shore up his base unless he has the luxury of Hillary being the Democratic nominee. If she is the Democratic nominee, he has more latitude in that regard, because conservatives will vote in droves for Satan himself to defeat her.
Against Obama, McCain’s most likely VP will be Tom Pawlenty.
sorry, typo, Tim Pawlenty