[savedbygrace]

They pick VP running mates because the latter agrees with the former on a majority of the issues.

Not true, else we wouldn't have gotten Bush41. (And Gore would never have picked Lieberman. I could go on with other examples, but two are enough for now.)

[Man50D]

Not true, else we wouldn't have gotten Bush41.

Your claim is vague at best without citing specific examples where a Presidential candidate and his VP running mate disagree on a majority of the issues. It smacks of logic for one to choose a running mate who he or she will be constantly butting heads! Party unity would not exist without the two being in agreement on most issues. Palin will have to compromise her conservative principles far more as VP to appease her boss than McCain will have to compromise his socialist beliefs to appease his subordinate.