A new Rasmussen poll
finds that Sen. John McCain (R-AZ) could potentially be in trouble with Republican voters back home in Arizona, where he's often faced criticism from the right for his views on immigration.
In a potential Republican primary for his 2010 re-election, the 2008 GOP nominee for President is in a dead heat with former Rep. J.D. Hayworth, a hard-line conservative who lost his seat in the 2006 Democratic wave.
The numbers: McCain 45%, Hayworth 43%, with a Â±4% margin of error. A third candidate who is already in the race, former Minuteman leader Chris Simcox, gets 4%.
From the pollster's analysis: "For McCain, the GOP Primary appears to be his biggest challenge since no major Democrats in the state have stepped forward yet to run against him."