If Trump wins and I were a liberal/progressive that was honest with myself I would blame Obama. You know, the head of the Democratic Party for the last eight years? The man that set the agenda for the party and made it all happen?
It would be a tough road, a bitter pill to swallow and would entail real, truthful examination of the stats surrounding the last eight years. It would mean casting off falsified stats on the economy, job growth and unemployment among others. It would take an unbiased look at our mounting debt that has increased at a rate unheard of since the inception of the nation. It would take looking at an administration that chose to lie and sensationalize its accomplishments to bolster its image while aggressively pursuing social issues at the expense of issues that would benefit all the people of the nation. It would take looking carefully at the degree of the effects of executive orders instead of proclaiming that others did things through executive order too. It would mean understanding that race relations have been set back decades under this administration. An administration that vastly widened the divide between races and genders in an attempt to then make it all better and come out on some moral high-ground but failed and only made it worse.
You place the blame where it is due. That's either on Obama or yourself if you voted for him. Pick whichever keeps you most firmly in your safe space.