DSCC extends ad buy in Arizona Senate race

The extended buy comes as Richard Carmona announced raising $2.2 million in the third quarter, double what the candidate raised the quarter prior. He's outperformed President Obama in most recent polls, holding GOP Rep. Jeff Flake to a single-digit lead and leading him slightly in the most recent poll.

The National Republican Senatorial Committee also invested in the race this week, spending $550,00 on a buy to run through Oct. 11.

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