The Democratic party did what parties generally do.  They make a choice of a candidate as early as possible.   Besides which Bernie Sanders in an Independent, which I admire, and should not have expected party support over Clinton and her long history with Democrats.   To be honest, I don't think it had much to do with the outcome.  Clinton had a very long history of public scrutiny, nobody goes unscathed that long in a magnified leadership role.

The AG announcement did much more harm to Clinton, but I don't think it was an intentional subversion on the political process, which the Russian actions clearly were.   (Our government has been  even more overt in trying to remove foreign leaders - we're no saints)

It shouldn't matter if you like or hate Clinton, the Russians have struck at the foundation of American  politics, a fair and peaceful exchange of power.    Please don't excuse  or minimize their action.