It should be obvious at this point to everyone except Warren and her campaign manager that she can’t win the nomination by conventional means. Here are her remaining paths to power:
1. She could stay in the race until the end, accumulate delegates, and prevail as a unity nominee at a brokered convention; or
2. She can agree to be the junior partner in a lefty unity ticket with Sanders. He could make her his prime minister of sorts, in charge of policy details and personnel, while he supplies the gruff authenticity and connection to working men she painfully lacks.
Could the second alternative work? If the realos remain splintered after Super Tuesday, yes; otherwise, the math says no.