A new poll finds Colorado Republican Cory Gardner neck and neck with the Democratic senator Mark Udall in what’s become one of the hottest Senate races of the midterm elections. Rasmussen Reports finds Udall with 43 percent support and Gardner, a two-term congressman, with 42 percent support, a virtual tie between the candidates.

The Rasmussen poll is just the latest to show first-termer Udall below 50 percent support, and Real Clear Politics’s poll average shows the race is a true toss-up. Both Udall and Gardner easily won their respective primaries this month, with Gardner clearing the Republican field earlier this year in a move that signalled to the national party the race was winnable.