Rasmussen polls the Arizona GOP Senate primary:

Senator John McCain has opened a 20-point lead over former Congressman J.D. Hayworth in Arizona’s Republican Senate Primary race. The latest Rasmussen Reports telephone survey of Likely GOP Primary Voters in the state shows McCain attracting 54% of the vote, while Hayworth earns 34%. For Hayworth, this represents another decline in support. In April, he picked up 42% of the vote. That fell to 40% in May, 36% in June and 34% in July. For McCain, the 54% level of support is his highest yet. “Some other candidate” picks up seven percent (7%) support, and six percent (6%) are undecided. Last month, McCain led 47% to 36%.

The primary is less than a month away, McCain and Hayworth have already debated twice, and McCain has spent $16 million. Hayworth probably needs McCain to make a huge gaffe for this race to get close before the August 24 primary.