If this was done to interfere, then it's the latest data-point in a long line of them that suggests our ancient party leadership is completely out-of-touch with the dynamics of elections, and is still living in the 20th century with respect to modi operandi.
Well, if you think that the impending Impeachment Trail starting on Tuesday won't influence the Iowa Caucus Result you are really blind here.
Sanders, Warren and to lesser extend Klobuchar are facing a dilemma. They want a "Fair Trail". However the more fairer that Trail gets, the more witnesses get called the less time Sanders and his two colleagues can spent on the Campaign Trail.
Speaker Nancy Pelosi basically has given the former Vice-President Biden a "Late Christmas Present" here. Biden can park himself in IA for the next two week unchallenged while Bernie, Elizabeth and Amy have to spent their precious time in Washington.