Some excerpts from the article from Rasmussen Reports -
Any incumbent who earns less than 50% support is considered potentially vulnerable, and McCain has been hovering around that mark all year. Since January, McCain’s support has fallen in a narrow 47% to 53% range. Hayworth's support has generally been in the low 40s.
The 2008 Republican presidential nominee cannot be comforted by the fact that his level of support in early primary polling is similar to the numbers for another veteran senator, Arlen Specter of Pennsylvania. Specter, ultimately defeated in the state's Democratic Primary by Joe Sestak, led in just about all early polling but could never get much above the 50% level of support.
The latest Rasmussen Reports statewide telephone survey of Likely GOP Primary Voters in the state Voters shows McCain picking up 47% support, while challenger J.D.Hayworth earns the vote from 36%. Navy veteran and Tea Party activist Jim Deakin picks up seven percent (7%) support. One percent (1%) like another candidate in the race, and eight percent (8%) are undecided.
Last month, McCain led Hayworth 52% to 40%.