Fox News: “Democratic presidential candidate Joe Biden is up 49-42 percent over President Donald Trump in a head-to-head matchup, according to a national Fox News survey of registered voters. Nine percent are undecided or back a third-party candidate.Since March 2019, Trump’s support has stayed between 38-42 percent, and Biden’s lead has been outside the poll’s margin of sampling error 16 times. At the same time, the Democrat’s current 7-point lead is a bit lower than his 8-point advantage last month (49-41 percent) and 12-point lead in June (50-38 percent). The poll was conducted Sunday through Wednesday, so over half of the interviews were completed before Tuesday’s announcement of California Sen. Kamala Harris as Biden’s running mate.”