how do big city cops vote?

[freepcrusher]

Obviously, law enforcement has probably been a republican constituency dating back at least to the McGovern era. But is there a variation between rural and suburban cops and big city cops?

I would always suspect that big city cops would be somewhat more likely to be democrats (although fancying a vote for a guiliani-like republican) because they are often pro-labor and many are members of a union of some type. Also, big city cops are obviously more likely to be racial or ethnic minorities.