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 FlakeJeffrey (Jeff) Lane FlakeMcConnell: 'Whoever gets to 60 wins' on immigration Huckabee Sanders: Dems need to decide if they 'hate' Trump 'more than they love this country' Trump spokeswoman fires back at Flake: 'His numbers are in the tank' MORE 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.