Barack Obama's public approval rating has dropped to as low as 47% in the last week, according to Gallup. Although the President will not appear on the ballot again until 2012, how the public views his presidency will have a direct impact on each party's performance in next year's mid-term elections.

The party holding the White House has lost seats in 10 of the last 12 mid-terms, going back to President Kennedy's 1962 losses. Even in that year, with a 74% approval rating following the resolution of the Cuban Missile Crisis, Kennedy’s Democrats lost seats in the House. Historically, the public uses mid-term elections to correct for the perceived excesses of the party in power, while the absence of coattail effects may result in some seats reverting back to the party with the natural advantage in the district.

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