Joe Biden is the 2020 Democratic front-runner. Now he has a target on his back.

pa href="https://news.yahoo.com/joe-biden-2020-democratic-frontrunner-090001985.html"img src="http://l1.yimg.com/uu/api/res/1.2/xmFNPRAcDnFNtqGPE9e6sQ--/YXBwaWQ9eXRhY2h5b247aD04Njt3PTEzMDs-/http://media.zenfs.com/en-US/homerun/usa_today_news_641/3dc3934dac4751a0b5aaabc5ea21a1ed" width="130" height="86" alt="Joe Biden is the 2020 Democratic front-runner. Now he has a target on his back." align="left" title="Joe Biden is the 2020 Democratic front-runner. Now he has a target on his back." border="0" /aThe entry of Joe Biden into the 2020 campaign isn’t exactly sending tremors through the Democratic field or the electorate in the very early going.pbr clear="all"