Obama and his handlers like Jarrett at least think they've got better contingency plans to milk a "default" than go for some sort of ZOMG Constitutional Crisis..
I think the metric to predict what they will do is this: Everything Obama and the hard-Left of the DNC has done over the past 5-6 years has been aimed at preserving, and growing structural permanent majorities for themselves. Forcing everyone onto Obamacare (designed to fail, to pave the way for single-payer), amnesty, all the union skullduggery etc. The talk of "turning Texas blue" etc.
It's all about building permanent > 50% leftist/Democrat majorities in the U.S. forever, even if they run the country into the ground doing it. Like most Leftist policy, it's all about getting the camel's nose in the tent, their foot in the door etc. and they'll "fix it later".
Does "Going Lincoln" help or hurt that cause?