I agree with this analysis that reminds us peaceniks that the Democrats who replaced Republicans on November 7 are no doves. Indeed, they're mostly "Blue Democrats," as likely to hold conservative views on domestic and foreign affairs as not.
So, I agree, this is no time for us lefties to dance with glee. Rather, we must, with as much determination as before November 7, take to the barricades to demand the same changes in policy that we've been demanding for years. The only change, perhaps, is the environment in which we make those demands: an environment that may be a bit more receptive. Which means, of course, that we must make our demands all the louder, all the more strident, now driven by the hope that we may, at long last, be heard.
(Here, however, is a different take on the result of the election in the House: The progressive coalition of representatives will be the largest of the sub-coalitions of the Democratic majority and this, coupled with the presence of many progressives in leadership positions, make the progressives the most powerful component of the House.)