Sometimes, especially in moments of national stress, one American flag isn’t enough to wrap around the country’s multiple points of view. As the Tea Party rallies have spread around the country this past year, they’ve brought with them a profusion of flags far beyond the usual Stars and Stripes. There’s been plenty of red, white, and blue at Tea Party events, certainly — but some of it is in different patterns than usual. Other flags are black and white; still others are bright yellow. There are letters and numbers and words in the mix. Also rattlesnakes. Lots of rattlesnakes. The...