Presumptive Republican presidential nominee John McCain (L) stands with Alaska Governor Sarah Palin at a campaign rally in Dayton, Ohio. McCain unveiled a major surprise in the White House race Friday by picking a little known governor from the oil-rich state of Alaska as his running-mate.(AFP/Getty Images/Mario Tama)AFP - Barack Obama and John McCain were to hold rival rallies in the key battleground state of Pennsylvania Saturday as the race for the White House intensified with McCain’s surprise pick of Alaska’s little-known governor, Sarah Palin, as his running mate.

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