While still expected to take control of the lower house, Democrats have seen their odds of regaining the House of Representatives decline.
In data updated on Tuesday, the site gave the Democrats an 73.6 percent chance of regaining control of the lower house, versus a 26.4 percent chance that the Republicans will maintain their majority.
This represents a 6.4 percent decline from two weeks ago, when Democrats were given an 80 percent chance of retaking the House, as well as a 6.4 percent increase for the Republicans, who last week were given a 20 percent chance of keeping control of the House.
RealClearPolitics' "Battle for the House 2018" map, accessed Tuesday, also showed the needle moving slightly in favor of the Republicans, with the GOP having 198 seats as secured, likely, or leaning.
This represents an increase from the 189 seats the Republicans were given by the map two weeks ago. Seats labeled "toss-ups" declined from 40 two weeks ago to 32 this week.
By contrast, the Democrats were listed as having 205 as either secured, likely, or leaning, just one less than the 206 reported two weeks ago.