Wolfe Research analyst John Janedis downgraded Charter Communications Inc. and Altice USA Inc.. Janedis downgraded Charter to Underperform from Peer Perform with a price target of $621, down from $712, implying a 4.8 percent downside. Janedis downgraded Altice to Peer Perform from Outperform with a price target of $17, down from $26, implying a 5.1 percent upside. Janedis sees cable operators continue…