One month after formally announcing her candidacy for governor, Texas Sen. Kay Bailey Hutchison (R) has retaken a lead over incumbent Rick Perry in the latest Rasmussen poll.

Primary Election Matchup
Hutchison 40 (+4 from last survey, 7/15)
Perry 38 (-8)
Medina 3 (n/a)
Not Sure 19 (+5)

Both candidates have nearly identical favorable ratings among the Republican primary electorate -- Perry is at 72 / 26 split, Hutchison at 71 / 26. Perry's job approval rating is at 69 percent among Republicans, while 29 percent disapprove. President Obama's approval rating among Texas Republicans is just 18 percent.

The automated telephone survey was conducted September 16 among 790 likely primary voters, with a margin of error of +/- 3.5 percent.