New Jersey first lady Tammy Murphy announced Sunday that she’ll withdraw from the Democratic Senate primary, likely paving the way for Democratic Rep. Andy Kim to secure the nomination.“After many busy, invigorating and, yes, challenging months, I am suspending my Senate campaign today,” Murphy said in a video posted to social media.“I’ve been genuine and factual throughout,” she continued. “But it is clear to me that continuing in this race will involve waging a very divisive and negative campaign, which I am not willing to do.”“I’m making this decision because this…