Steelers extend D.C. dominance

The Redskins haven’t beaten the Steelers in 20 years.  They’ll have to wait another four to break the streak. In throwback jerseys that inducted equal parts vertigo and nausea, the Steelers trounced RG3 and company, 27-12. Ben Roethlisberger completed 24 of 33 passes for 222 yards and three touchdowns to lead the way.  And tailback…