voting patterns in each state since 1984

[RIP Robert H Bork]

Because Republican states are less likely to go Democrat than Democratic states are to go Republican.

For example, in the past ten elections (1968 to 2004 inclusively), not one state voted Democrat all ten times, but eleven states voted Republican all ten times (Alaska, Idaho, Indiana, Kansas, Nebraska, North Dakota, Oklahoma, South Dakota, Utah, Virginia, Wyoming).