For those who didnt already know, Cuyahoga county is Ohios most populous county. Here are the results from 2000 and 2004.
2000:
Gore 359,913 (62.62%)
Bush 192,099 (33.42%)
2004:
Kerry 448,503 (66.57%)
Bush 221,600 (32.89%)
As you can see, the Democrats increased their total votes by 88,590 and their winning margin 51,188. Obamas goal will be to increase those totals even higher, since hell have even less appeal in Ohios rural areas in the southeast, central, and western parts of the state.