The "Bradley" effect

There has been and will continue to be a lot of discussion about the so-called Bradley effect and the chances for Sen. Barack Obama to become the nation's first African-American president.
It is a refererence to California's 1982 election for governor involving former Los Angeles Mayor Tom Bradley and then-Attorney General George Deukmejian.
Bradley had held a wide lead in most public opinion polls, but lost by 50,000 votes.
Pollsters attributed it to voters lying to them, but the answer was actually in a Republican strategy to boost its absentee voter effort that allowed Deukmejian to overcome Bradley's strength on election day.
After that election, both parties began to put more and more effort into absentee voters to the point where they now represent anywhere from 25 to 50 percent of the total vote.