a smaller correlation 

Plot of REAGAN84 with REAGAN80 ++++++++++++++++ 100+ +      R   87.5+ +   P   C   T   75+ 1 + V  1  O  11 1 1  T  1 1 1  E  1 2 1 1  62.5+ 2 1 1 1 + F  1 13431 21  O  1 1  R  111231   1 1  R 50+ 11 + E   A   G   A   N 37.5+ + ,     1   9   8 25R + 4         12.5+ +         0+ + ++++++++++++++++ 0 15.38462 30.76923 46.15385 61.53846 76.92308 92.30769 PCT VOTE FOR REAGAN, 1980 50 cases plotted. Regression statistics of REAGAN84 on REAGAN80: Correlation= .85 RSquared= .73 Intercept = 25.8 Slope = .67 
Note that, by dropping Washington from the analysis, the correlation drops from r=.90 to r=.85, a loss of .05.
