Trump up big in Nevada
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Republican presidential front-runner Donald TrumpDonald John TrumpKoch-backed group launches six-figure ad buy against Heitkamp Anti-abortion Dem wins primary fight Lipinski holds slim lead in tough Illinois primary fight MORE holds a commanding lead in the party’s Feb. 23 Nevada caucuses, according to a CNN/ORC poll released on Wednesday. 

Trump has 45 percent support, followed by 19 percent who said they are backing Sen. Marco RubioMarco Antonio RubioRubio: McCabe 'should've been allowed to finish through the weekend' For Tillerson, bucking Trump became a job-killer At least six dead after pedestrian bridge collapses on cars in Florida MORE (R-Fla.), 17 percent who are backing Sen. Ted CruzRafael (Ted) Edward CruzCruz says Cambridge Analytica assured him its practices were legal Dem battling Cruz in Texas: ‘I can understand how people think this is crazy’ Overnight Tech: Facebook faces crisis over Cambridge Analytica data | Lawmakers demand answers | What to watch for next | Day one of AT&T's merger trial | Self-driving Uber car kills pedestrian MORE (R-Texas) and 7 percent who are backing retired neurosurgeon Ben Carson.

Ohio Gov. John Kasich (R) comes in fifth, with 5 percent support, followed by former Florida Gov. Jeb Bush, with 1 percent support.

Forty-one percent of caucusgoers say they are still deciding who they will support in the race.

Trump is up in the poll by 7 points since October, while Rubio gained 12 points and Cruz 13.

The billionaire businessman is seen as the best candidate by overwhelming margins to handle the economy and curb illegal immigration, according to respondents.

He is also the favorite candidate in terms of foreign policy and on social issues like gay marriage and abortion.

Thirty-five percent of respondents said Trump best represents conservative values, compared to 22 percent for Cruz and 20 percent for Rubio.

The CNN/ORC poll surveyed 245 likely Republican caucus voters from Feb. 10-15. It has a margin of error of 6.5 percent.