While notable, the amount of money pouring into Democratic campaigns could be a mixed blessing. It suggests the party's primary may feature a long and protracted fight at a time when some would like to see a clear front-runner emerge. The lead-off Iowa caucuses are Feb. 3, and Sanders, Biden and Buttigieg have been among the leaders of the crowded field, along with Massachusetts Sen. Elizabeth Warren, the one top candidate whose latest fundraising may not be as strong.