EAGAN, Minn. — The Vikings on Monday announced they have acquired quarterback Trevor Siemian from the Denver Broncos. Originally a seventh-round pick in 2015, Siemian has started 24 of 25 games for the Broncos in the past two seasons. The Broncos went 13-11 in starts by Siemian, who has completed 495 of 835 passes (59.3 percent) for 5,686 yards with 30 touchdowns, 24 interceptions and a passer rating of 79.9. Siemian has been sacked 64 times. Siemian is a Florida native who played collegiately at Northwestern. He will join starter Kirk Cousins, who signed with the Vikings last week in...