Early elections results show a tight race between Rep. Greg Gianforte (R) and his challenger, Kathleen Williams (D).
At 10 PM, state elections results showed Gianforte leading Williams.
By 10:30, Gianforte's lead strengthened to 51 percent.
About a quarter of all state votes are in.
But many election results aren't expected to come in until early next morning in Montana's most populated counties, including Missoula and Gallatin.