In 1994, an electoral tsunami washed House Democrats out of the majority for the first time in forty years. The runoff returned them in twelve years. Four years later, pundits predict another Republican wave in Washington. Memory won't permit attribution, but someone recently wrote about sine waves, suggesting that politics runs in similar cycles. The facts, though, suggest that, if politics resembles wave action, it is not mathematical sine waves, but more like radio waves in which the frequency and amplitude are constantly variable. Forty years. Twelve years. Four years? The frequency is increasing. It took twelve years for Republicans...