WASHINGTON (Reuters) - Republican presidential candidate Tim Pawlenty will question President Obama's handling of the "Arab spring" movement on Tuesday in what is being billed as a major foreign policy address. Pawlenty, in a speech in New York, will say that Obama has failed to carry out "an effective and coherent strategy" in response to uprisings in NAfrica and the ME, according to speech excerpts released by his campaign. "He has been timid, slow, and too often without a clear understanding of our interests or a clear commitment to our principles," Pawlenty is to say.