YOU ALL IGNORE SIMPLE MATH
First, we know the balance between the two parties is fairly even.
The sad truth is that a Hillary/Obama or Hillary/Richardson ticket will bring out millions of previous non-voters based only on their gender/race. That is enough to tip the balance. Period.
Hillary's VP selection will be based on the Republican candidate. If someone like Tancredo is the nominee, Hillary will pick Richardson. Anyone soft on immigration and Hillary will pick Obama.
This can not be denied. She is confident that the race is hers to loose.