Why? It's the primaries. Candidates compete. Don't you remember George Bush Sr and his "voodoo economics" slur against Reagan? VP selection comes later.
That being said, I don't think Bachmann is going to fare too well with conservatives by attacking Sarah.
Yeah, but you don’t hand ammo to the dems to use in the general election. Much better to tout your own ideas, etc then slam your erstwhile ally.
What, so you think the voodoo economics comment was a good thing for the Republican Party?