There’s no denying that there was a surge in excitement among Democrats when Vice President Kamala Harris officially replaced President Joe Biden atop the 2024 presidential ticket. There’s also no denying that much of that “momentum” appears to have hit a ceiling, and it’s all baked into the numbers. Just ask CNN’s very own political director. In a now viral clip from CNN’s Wednesday morning programming, political director David Chalian tried to put a positive spin on this stalled momentum — but he had to admit “trouble” was looming nonetheless. “So there’s still room here for Harris to grow …