Possible, but, unlikely.
Why? With the Republican National Convention in Minneapolis and Saint Paul, Minnesota this time and with Governor Pawlenty as a popular moderate Republican, having a McCain/Pawlenty ticket is very possible. I prefer either Sarah Palin, Mark Sanford, or Mike Pence as the final VP choice, but I still see McCain picking either a Democrat or a RINO Republican as his final choice for VP, which will also upset a majority of conservatives. I’m still guessing that McCain picks Charlie Crist for VP.