Democrats need to point out that they're turning over to the new Republican Congress an economy that is doing better than at any time in the past six years. They need to lay this down as a benchmark that they can later point to, no matter what happens. Republicans are already chomping at the bit to claim all that credit for themselves.
The Boston Globe about Wall Street's secretly purchased influence in Washington, D.C. was somewhat mistitled as being about the "struggle for the Democratic Party's Soul." It's also about how Wall Street's virtually unlimited cash secretly influences the key debates as well as the policy outcomes in the nation's capital.
Ultimately, there is no way to be sure that the so-called right decision has been made before it has been made and acted on. All you can do is ensure that the process of decision-making is deliberately and painstakingly executed. That doesn't guarantee the best decision, but it sure makes it a lot more likely.