Major union flips support from Sanders to Biden [View all]
The issue of Bidens electability was the driving force behind the decision and a key concern of the unions membership, which was randomly surveyed by phone in an extensive poll conducted by a professional pollster ATU hired, Costa said.
The numbers came back very strong for Joe, Costa said, declining to discuss details of the internal survey. Not only did people support him, but we asked who would be best to beat Trump, and he was overwhelmingly seen as the best to do it.
The endorsement comes at a critical time for the two candidates ahead of Mondays caucus in Iowa, where Sanders has a marginal lead in polling averages.
Both men have also slugged it out with union endorsements, with Sanders scoring the support of the American Postal Workers Union Thursday. Sanders worked hard for the ATU endorsement as well, and on Jan. 23 tweeted heralded its successful 84-day strike in Virginia that ended Jan. 16. Four days after Sanders tweet, Biden also congratulated the union via Twitter.