1. Since Day 1, Obama has had the lead in elected delegates. In other words, there is no evidence that at any time during this process Clinton was widely preferred over Obama, or even liked quite as much.
2. Even ‘going negative’ she couldn’t catch up. In the process she has engaged in conventional race-baiting, implied (by non-denial denial) that Obama might be an Islamic terrorist (!), and most recently has even implied that the ‘Republican’ is a better candidate than Obama (!). What’s more, the ex-president threw away his credibility as a parent-figure for the Democratic Party. (We now have only one ex-president who is a parent-figure, and he is quite elderly; we do also have a couple of ex-vice presidents, although one of them is elderly, obscure, and a very bad campaigner. :) )
3. Clinton has so rubbed people the wrong way that African-American congressunits have made, if only to placate their constituents, public shows of disapproval.