(CNN) It was the summer of Sanders ... and maybe the winter of Sanders, too?

Vermont Sen. Bernie Sanders is gaining on Hillary Clinton for the Democratic nomination, according to CNN's Political Prediction Market.

Sanders, who is in a dead heat with Clinton in recent polls of the early caucus state of Iowa and has been ahead of her in the early primary state of New Hampshire, has seen his odds of winning the nomination grow to 19%, which is 10 percentage points higher than his odds a week ago.

Clinton is still the clear favorite among players on the Political Prediction Market, but her odds of winning the nomination slipped from 91% last week to 79% on Tuesday.

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