The United States Electoral College is a term used to describe the 538 President Electors who meet every 4 years to cast the electoral votes for President and Vice President of the United States; their votes represent the most important component of the presidential election. 270toWin.com has a collection of maps showing how the Electoral College has voted by state since 1788.
2008 – Uncolored states are undecided and their electoral votes are up for grabs. Colored states lean either Republican or Democratic.
2004 Electoral Vote Map
2000 Electoral Vote Map
1996 Electoral Vote Map
1992 Electoral Vote Map
1988 Electoral Vote Map
1984 Electoral Vote Map
1980 Electoral Vote Map
more at 270toWin.com