McCain is planning to roll out his VP choice in a large rally in Dayton, Ohio, at noon on Friday, followed by join appearances in Pennsylvania and Missouri, sources said.
Over the past few days, the media's focus has been narrowed to three potential options for McCain: former Massachusetts Governor Mitt Romney, Minnesota Governor Tim Pawlenty and Connecticut Senator Joe Lieberman.
Romney seems to have garnered the most attention, in light of Barack Obama's selection of Joe Biden as his number two. Romney is thought to have the ability to hold his own against the Delaware senator, who is known for his formidable debating skills. But the controversy over McCain's failure to state off the top of his head how many houses he owns could mean that picking Romney—a multimillionaire businessman with four houses of his own—would open the Republican ticket to charges of being out of touch.
Sources close to the McCain campaign have indicated that Lieberman, an independent Democrat, is very much in the running. But choosing a pro-abortion rights senator who caucuses with the Democrats could leave next week's Republican convention in upheaval.