Jay-Z, an avid Barack Obama supporter, will play two free concerts this weekend to promote the Democratic presidential nominee's campaign and voter registration. The first show will take place at the Cobo Arena in Detroit on Saturday. Then, in true Hova fashion, the rap star will travel from Detroit to Miami for the second show, which will take place at the Bayfront Park Amphitheatre on Sunday. Voter registration for the upcoming election ends Monday in both Michigan and Florida. Republican presidential candidate Senator John McCain and Obama will face off in their second debate on October 7 in Tennessee.

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