Bernie Sanders', I-Vt., and Elizabeth Warren's, D-Mass., 2020 candidacies.
His comments came after the University of New Hampshire released a poll showing Sanders beating former Vice President Joe Biden by double digits — 30 percent to 18 percent of likely Democratic voters in the granite state.
Although Sanders has frequently led declared Democratic candidates, Biden, who is expected to declare his candidacy in the coming days, has beaten him in previous polling.
Rove pointed to St. Anselm College's earlier polling which showed Biden leading Sanders by 7 percent (23 to 16 percent) among registered Democratic voters in New Hampshire, and Warren garnering 9 percent of their support.
As Rove pointed out, a fraction of Sanders' supporters backed Trump in the general election.