Tuesday marks four weeks until Election Day - and the latest numbers show a very tight presidential race among Nevada voters.

Numbers released by Rasmussen Reports Tuesday morning show Mitt Romney and President Obama dead even - 47% to 47%.

Just 3% prefer another candidate. And another 3% remain undecided.

This marks the highest level of support Romney has seen in the Silver State - nd a slip in numbers for the president.

In the polls from March through July -- the president had a 5-point advantage. 88% of Nevada voters polled say they're already certain of their vote.

In that group, Romney has just a 2% lead over the president.

To look at the entire poll yourself, go to http://tinyurl.com/7hecsaz