Trump campaigns in Kansas on Monday, Oct. 19, as Roger Marshall (Sen-R Kansas) trails Democrat Adam Hamilton by under a point in one poll

Trump holds a rally in Park City, outside Wichita, on Monday, Oct. 19, in a race CBS News calls a toss-up. An InsiderAdvantage poll of 1,200 likely voters on Oct. 9–10 had Hamilton at 47.5%, Marshall at 46.7% and Libertarian David Graham at 3.4%, within its ±2.83-point margin of error. Kansas has not elected a Democrat to the Senate since 1932, a 94-year Republican streak.