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In a new book, ex-Defense chief Robert Gates criticizes President Obama on Afghanistan. We asked our followers on Twitter how they would grade the president. Comments are edited for clarity and grammar:

I give Obama a B- on Afghanistan because of his inability to appear decisive, even when he is.

@BrentBrentl

I give Obama a C on Afghanistan. He needs to end the war and stop wasting lives and money.

@ogarcia37

It wouldn't be fair for me to grade him without hearing the same info he's heard. (And, no, I don't want it.)

@rudytheflyer

How can any president be graded cleaning up messes others left behind?

@Jmsphat55

At what point does a mess become the current president's problem? Seven years?

@Keelermatt

Obama has failed miserably in withdrawing all troops from Afghanistan.

@JeffOstach

Our effort in Afghanistan is a total failure. Look at our standing in the world. We're toothless and no longer relevant.

@eagleone1776

For more discussions, follow @USATOpinion or #tellusatoday on Twitter.

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