From a Washington Monthly article talking about how President Obama's second-term agenda and Hillary Clinton's support for it affects Clinton's recently announced 2016 campaign:
But it leaves the Clinton campaign with one remaining challenge - how to address the problem of gridlock and polarization that has plagued Congress and its relationship with the President. The truth is, there’s not a good answer to that question. The only way Hillary can present herself as someone who can change that is to suggest that it is at least partially President Obama’s fault. Only the truly deluded or completely uninformed believe that.
So here's the thing–"the problem of gridlock and polarization that has plagued Congress and its relationship with the President" is not something that any Democratic candidate can solve. It is not a Democratic problem.
Congressional Republicans have deliberately chosen a strategy of being the biggest dicks they possibly can at every opportunity. Nothing any Democrat does can change that. The Clinton campaign cannot avoid running into GOP obstructionism–their best bet is to grab hold of the agenda the Obama administration has laid out and run with it.