Sarah Palin rides to the sound of the guns. It was a chilly, wet and blustery afternoon in Madison, Wisconsin — one more appropriate for a late-season Packers game than a springtime political rally. The stirring NFL Films theme,  “The Classic Battle,” would’ve been a more apt musical choice than Van Halen’s “Right Now” to accompany Palin as she entered the stage outside the state capital building to address thousands of Tea Party members, along with a good number of extremely hostile, expletive-hurling government union rowdies.