Almost from the moment Trump entered the House chamber Tuesday night to deliver his State of the Union address, Democrats began to disrupt. It only deteriorated from there.Why it matters: It's the new normal for presidential speeches to Congress, with Republicans heckling Democratic presidents and vice versa.Tuesday's disruptions came despite House Minority Leader Hakeem Jeffries (D-N.Y.) repeatedly telling his members behind closed doors not to repeat the widespread disruptions that Trump faced...