Bloomberg by the Numbers: 59

Photograph by Mandel Ngan/AFP/Getty Images

Representative Hansen Clarke, Democrat of Michigan, assisted by Senior Advisor Kim Bowman, prepares for a vote on the floor in Washington.

That’s the number of U.S. House members who have been unseated during primaries since 1992.

Over the past 20 years, more  House members from Michigan have been defeated for re-election in primaries than in any other state.

Hansen Clarke’s loss August 7 was the sixth by a Michigan member in a primary in an 11-election span dating to 1992. Fifty-nine House members have been unseated in the primaries during that period, including a high of 19 in 1992. The 10 who have been unseated so far this year is the highest total since then.

A Michigan incumbent had to fall because Clarke was matched up with another House Democrat, Gary Peters, after changes in reapportionment and redistricting. Michigan is losing one of its 15 districts because it lost population last decade.

Clarke was elected to the House two years ago after beating incumbent Carolyn Cheeks Kilpatrick in the primary. And Kilpatrick was first elected in 1996 by way of toppling incumbent Barbara Rose-Collins in the primary.

Like Clarke, Democrat Lynn Rivers a decade ago was a victim of redistricting. She was paired with John Dingell, the House’s longest-serving member, and lost by 18 percentage points.

The other Michigan members are Republicans Joe Schwarz, unseated in 2006 by the more conservative Tim Walberg, and Guy Vander Jagt, who was a 26-year House veteran when he lost in 1992 to Pete Hoekstra (who won the Republican nomination for a U.S. Senate seat yesterday).

Georgia, Illinois, Pennsylvania and Texas each have had five House members denied renomination in the past two decades. California and Ohio follow with four apiece, while Maryland, New York and Oklahoma each have three. All of those states have held their 2012 congressional primaries.

One populous state not on the list is Florida, though that will change next week after voters choose between Republican incumbents John Mica and Sandy Adams, who are seeking the same district.

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