Dont just tell me your belief, tell me WHY?
Who would NOT vote for this ticket. Would you stayhome if Palin ran? How about Jeb Bush?
Lots of nominal and "moderate" Republicans - especially women. And we'd win almost no one to offset those losses. Democrats and left leaning indies are not going to cross over to vote for Palin/Bachman. Palin is too damaged and, outside of conservative circles, a bit of a joke at this point. I like Bachman a lot but, lets face it, she proved last election cycle that she is not a viable national candidate. She never recovered from her screeching and dopey comments over the HPV vaccine.
How about Jeb Bush?
I think we are more likely to see candidates like Rubio, Rand, Walker, Jindal, Christie, etc. The Bush brand is still dirt, Jeb will have to wait another cycle or two and even then enough time may not have passed.
As someone else said, if you believe Palin/Bachman would be an "unbeatable" ticket you are living in a conservative bubble with little understanding of the outside world.