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2016 presidential candidates Democrat Hillary Clinton and Republican Donald Trump.

(AP photos)

NEW YORK, N.Y. -- New York voters strongly favor Republican Donald Trump and Democrat Hillary Clinton in their parties' primaries, but no GOP presidential candidate would win the state in the general election, according to a new Siena College poll.

Millionaire businessman Trump stretched his lead among New York Republican voters to 27 percentage points, 45 percent to 18 percent over both Ohio Gov. John Kasich and U.S. Sen. Marco Rubio of Florida, with Sen. Ted Cruz of Texas finishing fourth, according to the poll.

Former Secretary of State Clinton would beat U.S. Sen. Bernie Sanders of Vermont, 55 percent to 34 percent, with 10 percent undecided, if the Democratic primary were held today, according to the poll. Clinton's lead was unchanged from the results of a Siena poll conducted a month ago.

Clinton or Sanders would both beat every Republican candidate in a head-to-head contest in the general election, the poll showed. Sanders would beat all Republicans by 19 to 37 percentage points. Clinton would beat all Republicans by 7 to 25 percentage points, with Kasich giving her the toughest run.

Registered Democrats outnumber Republicans by a 2 to 1 margin in New York. No Republican presidential candidate has won the general election in New York since Ronald Reagan in 1984, and it isn't likely to happen this year, the poll showed.

The Siena poll of 800 New York voters was conducted Feb. 28 to March 3, and released six weeks before New York holds its presidential primary election, on April 19. It has a margin of error of plus or minus 4.1 percent.

Supreme Court vacancy

Just over two-thirds of New Yorkers think the U.S. Senate should act if President Barack Obama nominates a Supreme Court justice to fill the vacancy on the court left by the death of Justice Antonin Scalia.

Among all New Yorkers polled, 67 percent said the Senate should act, 28 percent said it should not, and 5 percent were undecided.

Even among just Republican voters, 49 percent said the Senate should act on an Obama Supreme Court nomination while 44 percent said the Senate should not, and 7 percent were not sure.

Closing Gitmo

More than half of New Yorkers are opposed to Obama's plan to close the U.S. detention center for suspected terrorists at Guantanamo Bay in Cuba and transfer the prisoners to U.S. prisons.

Fifty-three percent polled oppose closing Gitmo, 38 percent support transferring the prisoners to U.S. prisons, and 9 percent were undecided.

Contact Mike McAndrew anytime | email | Twitter | 315-470-3016

Siena Poll of New York state voters on 2016 presidential election

Contact Mike McAndrew anytime | email | Twitter | 315-470-3016