LEBANON, Tenn. (WTVF) — Tennesseans will choose a new governor this fall. Republican frontrunner U.S. Senator Marsha Blackburn still has a commanding lead, but a new poll suggests the race is tightening. An internal poll released this week by Congressman John Rose's campaign said Blackburn has a 15-point lead over Rose. Back in May, a Beacon Center poll found Blackburn's lead was more than 50 points.