I'm not going to do a whole formal essay, but I'll do a paragraph or so description...
Waukesha County, WI: Known as the most powerful republican county in Wisconsin and probably one of the most in the nation (6th in republican vote margins!). It is the reason Wisconsin usually stays in play much of the time. Many elements make it so powerful, such as probably one of the highest turnouts in the nation, probably upwards of 80% VAP. The population is 389,891. In the 2012 presidential election, and 243,856 votes were cast, which is 5/8 of the population voting alone, which doesn't exempt people under 18 and criminal restrictions. Its nearly untouchable 2:1 % margin also makes it the most republican county in the state besides its neighbor to the north, Washington County. Its trended republican in recent years as well. This is the one area republicans can count one for big margins and their base vote. Three suburban/exurban Milwaukee counties in particular are D-proof, and that would be the Waukesha-Washington-Ozaukee group. Here are some recent elections to give you an idea:
2012 President: Romney (R): 162,798 (66.8%)Obama (D): 78,779 (32.3%)2012 Senate: Thompson (R): 159,450 (66.4%)Baldwin (D): 75,408 (31.4%)2012 Governor (Recall)
Walker (R): 154,316 (72.3%)
Barrett (D): 58,234 (27.3%)
2010 Senate:
Johnson (R): 134,051 (71.0%)
Feingold (D): 53,492 (28.3%)
2010 Governor:
Walker (R): 134,608 (71.5%)
Barrett (D): 52,684 (28.0%)
2008 President:
McCain (R): 145,152 (62.3%)
Obama (D): 85,339 (36.6%)
And here's a screenshot from Dave's App (2008 President):
(Keep in mind this is 2008, so things would usually be even more republican than this). And yes, McCain won Waukesha (with only 53%, Romney got 57%).
As for other statistics. Its 90% white, has a median income of $75,689 (upper class), and only 5% live below the "poverty line" (compared to 12.5% for Wisconsin overall). Its also very well educated, as 39% have a bachelor degree, and 96% graduated high school. Overall, this county is what you would call an elitist republican stronghold county. 
