There have very few polls for Nevada, which caucuses tomorrow. Blumenthal says we're "seeing fewer polls because of constrained budgets":
National media and polling organizations knew that attention would focus on the first four primary and caucus states in January and spent their money accordingly. A few invested in the expensive task of surveying Iowa's likely caucus-goers using live interviewers, but in an era when many media organizations have cut back on polling, these upcoming caucus states are simply a lower priority. As with other aspects of campaign coverage, polling in the February caucus states will be no match for what we saw last month.