At this point, some more donations simply don't matter. They are not racing "one more time" for prestige, courting the apathetic public who doesn't give much of a damn. They are having cold civil war on the verge of getting very hot. Two alliances on each other's throat. A counter-coup vs. counter-counter-coup, with crowds cheering both sides. Mere ads can't change much in this situation. For the same reason, the press is going to act on its own allegiances, thus isn't going to do anything more or less than it would do anyway.