Michele Bachmann has extended her lead over the announced Republican candidates, but she trails both Rick Perry and Chris Christie when both governors and Sarah Palin are included in a hypothetical preference poll of Republican primary voters.
Four Republicans (Christie, Mitt Romney, Bachmann and Tim Pawlenty) are each in a statistical tie with President Barack Obama when they are matched up against him. All other GOP contenders trail Obama.
These results are from an IBOPE Zogby interactive poll
conducted from June 28-30.
Bachmann also led among announced candidates in a June 21 IBOPE Zogby interactive poll, and has now added 10 percentage points to her total of 34%, giving her a 19-point lead over second place Herman Cain.
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