WASHINGTON (CNN) -- Republican National Committee Chairman Ken Mehlman said Monday his party is gaining significant momentum heading into Election Day, in a memo circulated to GOP leaders and supporters across the country.

The RNC head noted three national polls released in recent days that indicate Republicans had made large gains in generic match-ups with Democrats. Mehlman cited polls from ABC News/Washington Post, Pew Research Center, and Gallup -- all of which indicate the Democrats' lead has dwindled to single digits from a much larger margin a couple weeks ago.

Mehlman also said these recent polls indicate GOP enthusiasm is growing with less than 24 hours until voters head to the polls.

A new CNN poll indicates Democrats maintain a 20% margin among likely voters in a generic match-up.

For CNN's coverage of the midterm elections, check out America Votes 2006