A Des Moines Register poll released over the weekend shows democrat challenger Theresa Greenfield with a forty-six to forty three percent lead over incumbent republican Senator Joni Ernst. That could set the stage for a democratic takeover of the Senate in November.

South Dakota Senator John Thune, the number two republican in the Senate, says they know it will be competitive…

Thune says a lot can change by November….

Thune says the re-election campaign of President Trump will play into control of the Senate….

Democrats have to flip four of the Senate seats to take control.