Arizona Sen. John McCain is expected to announced his pick for vice president Thursday evening or Friday.
A source familiar with the search said a number of the VP contenders, including Minnesota Gov. Tim Pawlenty, former Massachusetts Gov. Mitt Romney, U.S. Sen. Joseph Lieberman, I-Conn., former Arkansas Gov. Mike Huckabee and others are expected to travel to Dayton for a Friday rally when McCain is expected to announce his running mate. That will create even more buzz around the pick, the source said.