Americans are shockingly weak in civics. The latest Annenberg Public Policy Center survey finds that only 39 percent could name the three branches of U.S. government and less than one-quarter know that Congress has to muster a two-thirds vote to override a presidential veto. The results are in line with a study by the Woodrow Wilson Foundation earlier this year which revealed that more than half of those polled do not know we have nine Supreme Court justices. Sixty percent didn’t know which countries we fought in WWII…