McCain would face tough primary rival in Hayworth

John McCain may have been the Republican Party's national standard bearer last year, but now it looks like he may have a hard time just hanging on to his Senate seat.

A new Rasmussen Reports poll of likely 2010 GOP primary voters in Arizona finds the longtime incumbent in a virtual tie with potential challenger, J.D. Hayworth. McCain earns 45% of the vote, while Hayworth picks up 43%.

Another candidate, anti-illegal immigration activist Chris Simcox, is picking up 4%.