PRINCETON, N.J., Feb. 21 (UPI) -- Rick Santorum has expanded his lead over Republican challengers, but Mitt Romney still is considered most electable in the U.S. presidential race, Gallup said.
Santorum, a former U.S. senator from Pennsylvania, opened a 10 percentage-point lead over the former Massachusetts governor, 36 percent to 26 percent, results the Gallup tracking poll released Tuesday indicated.