Thousands of liberal and labor activists rallied in the nation’s capital on Saturday and in other U.S. cities, calling for young or disillusioned Democrats to vote in the November elections. If conservative Fox commentator Glenn Beck’s late August rally invigorated tea party enthusiasts to vote for Republicans, many of those who turned out for the “One Nation Working Together” event saw it as their chance to shout back. Rally participants were determined but appeared fewer in number than at Beck’s “Restoring Honor” event. Enrique Alvarado, 29, a student from Boston College, charged that tea party activists are “intolerant and racist,”...