Every day for the past couple of weeks, there are approximately a dozen people waving Elizabeth Warren signs at the busiest intersection in Westford.  It takes place at the Route 110/Boston Rd./Carlisle Rd. intersection at the prime hours of heavy traffic:  5:00 p.m - approx. 6:30 p.m. and on weekend mornings 9:00 a.m. - 12:00 p.m. (approx.).  Where are our Scott Brown supporters?  Thousands of cars pass through here daily and we're all sitting in traffic jams at these times.  IBM, NetScout,…