Sen. Jon Tester (D-Mont.) and Rep. Dennis Rehberg (R-Mont.) remain statistically tied in their Senate race, according to a new poll from the conservative Rasmussen Reports.

Rehberg leads Tester by 49 to 47 percent, according to the poll, the latest to show the race within the margin of error.

The candidates had their first public debate last weekend, both have been on the air for weeks, and outside groups have pummeled both of them for months with attack ads. But the race has remained essentially unchanged since the beginning — the majority of polls going back to last November have had the candidates within three percentage points of each other. The Hill rates the race a "tossup."

The automated poll of 500 likely voters was conducted on June 18 and has a margin of error of plus or minus 4.5 percentage points.