KEY POINTS
  • "Warren is gaining more than any other candidate because her base support is more intense than any other candidate," Frank Luntz says.
  • The Republican pollster says Warren's voice is "new" and can command the debate stage with her opening remarks.
  • The Massachusetts senator, a champion of the left wing, has been gaining traction at the polls in a crowded field.

Sen. Elizabeth Warren has been moving up in the 2020 Democratic presidential nomination race because of her ability to market herself to voters, a longtime Republican pollster told CNBC on Friday.

"Warren is gaining more than any other candidate because her base support is more intense than any other candidate," Frank Luntz said on "Squawk Box," the morning after the latest Democratic presidential debate.