VP choice has almost no impact on how people vote. People vote for ( or against) the President; rarely the VP.
Having said that she is not a light weight, but it is hard to picture her in the typical Veep role--that of attack dog. She would never get flustered, and probably never say anything unguarded. She would always present herself as capable.
Many of her views are at variance with Romney's, and with the grass roots, too.
All in all, IMO, not the best pick for VP. Not a liability, but not much of an asset either.

__________________
1982 300SD " Wotan" ..On the road as of Jan 8, 2007 with Historic Tags