(CNN) Joe Biden has been officially running for president for less than a month. Today's RCP polling average puts Biden at 39% to Sanders' 16%. The trend line on Biden is where it should be (although he has dipped somewhat from his average of 41% last week). What that surge has done is turn the race into Biden in a tier by himself and then a gaggle of candidates -- Sanders, Harris, Buttigieg and Elizabeth Warren -- on a second tier well below the former VP. Biden, too, is limiting his public appearances to keep the chances of making a race-altering gaffe as low as possible.

Source: CNN May 17, 2019 23:26 UTC