Sarah will be free of jury duty at the end of the month and free of ethics charges from her time in office next week. She should give Obama a presidential sized bellyache on his birthday and announce on August 4.
A perfect birthday present to Obama. They say they want Sarah. Let it happen.
I'd be surprised if she would choose Obama's birthday. In reading Going Rogue, it's striking how much emphasis she puts on historic dates. She made the announcement of her run for governor on Alaska Day (when Russia turned over Alaska to the US), for example. Her love of history shines throughout the book. I suspect she'll do her best to pick a date that has some significance in American history.
August 2 is the anniversary of the formal signing of the Declaration of Independence, to throw out one possibility.