Nevada Sen. Harry Reid says he thinks 100,000 people will participate in the state Democrats' Jan. 19 presidential caucus.
Reid's prediction is more than double what many party officials and campaigns would consider a strong showing.
The Nevada senator's estimate is in line with early promises made by the Nevada Democratic Party.
The party is promoting the early caucus as a chance for Nevada to play a more influential role in selecting the nominee.
But in recent months party officials and presidential campaigns have tried to lower expectations.
Many believe a turnout of around 45,000 people - about 10 percent of registered, active Democrats - is more realistic.
Reid says he stands by his 100,000 estimate.
The Democratic candidates are coming to Las Vegas later this week for a debate sponsored by the state party and televised on CNN.