The WORST possible thing you can do with money is to give it to a blanket source, who then "disburses" it according to perceived need, when in reality they are giving it to whomever they damn well please, including NOT giving it to their potential primary opponent.
So I say, let's ENCOURAGE them to do this!! Follow the money and follow the results, and you will most probably find DNC-endorsed candidates do far worse than non-endorsed candidates in competitive races. (I don't count 94% Dem districts as part of the equation.)