Clinton wins by a margin between 1988 and 2008.
Paradoxically, the elder Bush got little more of the popular vote in 1988 than Obama got in 2008.
Bush 53.37 -- Dukakis 45.65
Obama 52.86 -- McCain 45.60
But the elder Bush won 426 electoral votes, and Obama won 365.
To get 426 or more votes by adding to the Obama 2008 win, Hillary Clinton would need to also win
MO 375
MT 378
GA 393
SD 396
AZ 406
ND 409
SC 417
TX 445
...which isn't going to happen.
Let's try adding states to 2012.
She would have to win North Carolina (347), NE-02 (348), Georgia (364), Arizona (376), Missouri (386), and the inner arc (Louisiana to West Virginia, states that Bill Clinton won twice but Obama lost by huge margins twice -- 424). If Hillary misses on one of the states of the inner arc (AR, KY, LA, TN, WV) she would have to pick up Indiana or South Carolina to get into the area of 420 electoral votes.
The American electorate is extremely polarized. Democrats are going to find poaching recent Republican voters difficult -- and Republicans are going to find poaching away recent Democratic voters difficult, except perhaps on local issues within states. Even corruption and gross incompetence seem to matter little. Demographic change and migration may matter more.