Former Alaska Governor Sarah Palin is shaking up a Republican presidential field just starting to take shape, injecting her unconventional campaigning and celebrity into what had been a sleepy start to the party’s 2012 primaries.

It’s not clear what Palin, 47, is up to as she travels the East Coast on a deluxe tour bus emblazoned with a Liberty Bell and phrases from the U.S. Constitution and the Pledge of Allegiance — whether she will choose to run for president or how she will seek to affect the race with her re-emergence on the national scene.

“I don’t know, I honestly don’t know” about seeking the presidency, Palin told reporters who caught up with her yesterday in Gettysburg, Pennsylvania, according to the Associated Press.

What is evident, say party strategists and political observers, is that Palin, Senator John McCain ’s 2008 vice presidential running mate, would be a force if she chose to join the fray and can also shape the contest even from the sidelines.

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