Where will the Senate majority be decided? Senate Majority PAC’s late-summer ad buy is in 4 Democratic-held seats -- Indiana, Missouri, North Dakota and West Virginia -- and two Republican -- Nevada and Tennessee Via@WaPoSeanhttps://www.washingtonpost.com/powerpost/top-senate-democratic-super-pac-investing-17-million-in-august-tv-ads/2018/07/31/2f21dabc-950c-11e8-80e1-00e80e1fdf43_story.html?utm_term=.6e2bca7387c1 …