Graham Platner privately told staff that he is planning to officially file paperwork to end his Senate campaign on Monday — the drop-dead deadline for him to exit the race. Why it matters: Though Democrats largely appear to think Platner is done with his bid, his last-minute timing is likely to cause a final pang of anxiety within the party. Driving the news: Platner made the comments to his team Wednesday night shortly before he announced publicly he was suspending his campaign. "On Monday, I