There are 34 Senate seats up for election in 2020 — including a special election in Arizona — many of which are expected to be brutally competitive as Democrats vie for control of the Senate. Quick take: The U.S. Senate is currently made up of 53 Republicans, 45 Democrats and 2 independents who caucus with the Democrats. Dems must win 3 or 4 seats to take control of the Senate — 4 to recapture control — or 3, if they also win the vice presidency. Some of the fiercest races will come from Virginia, North Carolina and New Hampshire, according...