Saturday Night Live took aim at Donald Trump’s recent re-tweets from young and less-than-fully-informed Americans supporting his opposition to CNN. “Kellyanne,” said Alec Baldwin as Trump in tonight’s cold open, “I just retweeted the best tweet. I mean, wow, what a great smart tweet.” Looking into the camera, Baldwin drove the point home, telling viewers: “I really did retweet him, seriously.” Added Kate McKinnon’s Kellyanne Conway: “He really did do this.” “It was from a…