Donald Trump Solidifies His Lead, but Leaves Many Nervous

Donald J. Trump occupies his strongest position yet in the race for the Republican presidential nomination, yet nearly two-thirds of American voters say they are concerned or frightened about the prospect of a Trump presidency, according to the latest New York Times/CBS News nationwide poll.

The poll was taken largely before his statement on Monday afternoon proposing to temporarily bar Muslims from entering the United States.

On the Democratic side, the poll found Hillary Clinton is maintaining her 20-point lead over Senator Bernie Sanders of Vermont. The possibility of her winning the presidency in 2016 is only marginally more palatable to American voters than that of Mr. Trump.

Mr. Trump commands the support of 35 percent of Republican primary voters, leading his closest competitors, Senator Ted Cruz of Texas (16 percent) and Ben Carson (13 percent) by a more than 2-to-1 margin. While Mr. Carson’s support was cut in half since the last time The Times and CBS News polled on the race in late October, Mr. Cruz has quadrupled his share. Senator Marco Rubio of Florida’s support stands at 9 percent, with the rest of the candidates at 4 percent or less.

Enthusiasm for and attention to the campaign are higher among Republican primary voters than among their Democratic counterparts. A 54 percent majority of Democratic primary voters said they had made up their minds about who they will support, while 64 percent of Republicans say it is still too early to be sure. Majorities of Trump and Clinton supporters say their decision is firm.

Over all, 24 percent of voters expressed concern and 40 percent fear about what Mr. Trump would do if elected president, whereas 23 percent said they are concerned and 34 percent scared about the possibility of a Clinton presidency. Not surprisingly, voters were sharply divided along partisan lines.

While Republican voters were most likely to say they were excited (24 percent) or optimistic (41 percent), a full one-third of Republicans say they are concerned or scared about Mr. Trump. Mrs. Clinton’s base views her potential presidency more favorably than does Mr. Trump’s. Twenty-two percent of Democratic voters are excited and 54 percent are optimistic, while only 23 percent said they were concerned or scared.

The nationwide telephone poll was conducted Dec. 4-8 with 1,053 registered voters, including 431 Republican primary voters and 384 Democratic primary voters. The margin of sampling error is plus or minus 4 percentage points for registered voters and plus or minus 6 percentage points each for Republican and Democratic primary voters.