The Democratic Party ran candidates in races for all seventeen seats, while the Republican Party contested eleven seats. The Green Party contested ten races (an increase from the single seat they contested in 2006). Democrats increased their majority, flipping a control of a previously-Republican seat. However, Democrats also saw a more than 9-point decline in their share of the cumulative popular vote: with Republicans and Greens each seeing a more than 4.5-point increase.
Background
The previous elections to the board had been held in 2006. The 2006 elections had been a wave election for Democrats nationally. The 2010 elections, by contrast, were a wave election for the Republicans nationally, with impacts of that wave seen in Illinois elections.
Incumbent fifth-term Commissioner Joseph Mario Moreno, a Democrat, lost reelection, being unseated in the Democratic primary by Jesús "Chuy" García, who went on to win the general election.
Primaries
Democratic
Cook County Board of Commissioners 7th district Democratic primary[2]
Incumbent Commissioner Edwin Reyes, a Democrat, who been appointed in 2009 after Roberto Maldonado resigned to serve a Chicago alderman, was elected to a full term.
Primaries
Democratic
Cook County Board of Commissioners 8th district Democratic primary[2]
Incumbent Commissioner Bridget Gainer, a Democrat first appointed in 2009 (to fill the vacancy left after Mike Quigley resigned to assume office as the United States congressman), was elected to a full term.
Primaries
Democratic
Cook County Board of Commissioners 10th district Democratic primary[2]
No candidates, ballot-certified or formal write-in, ran in the Republican primary.[2] The Republican Party ultimately nominated William C. "Bill" Miceli.
Green
No candidates, ballot-certified or formal write-in, ran in the Green primary.[2]
General election
Cook County Board of Commissioners 12th district election[1]
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