Hillary Clinton leads Donald Trump by four points in a four-way contest in Florida and by six points head-to-head, according to a Suffolk University poll released Thursday.

In a four-way contest, Mrs. Clinton had a 4 point lead over Mr. Trump, 43 percent to 39 percent, with Libertarian Party presidential nominee Gary Johnson at 4 percent and Green Party candidate Jill Stein at 3 percent.

Mrs. Clinton’s lead expanded to 6 points, 48 percent to 42 percent, in a hypothetical head-to-head matchup with Mr. Trump in the poll, which was conducted Monday through Wednesday.

The latest Real Clear Politics average on the crucial battleground state shows Mrs. Clinton with about a 3 point lead over Mr. Trump. The average includes the Suffolk poll.

Analysts caution that a more accurate picture of the presidential race should develop once the potential polling effects of the parties’ conventions settle, but other surveys released since last week’s Democratic National Convention have likewise shown Mr. Trump trailing in key states such as Pennsylvania, New Hampshire and Michigan.

In Florida’s U.S. Senate contest, Sen. Marco Rubio was well ahead of his potential Democratic opponents. Mr. Rubio had about a 15 point lead over Democratic Rep. Alan Grayson and about a 14 point lead over Democratic Rep. Patrick Murphy.

Mr. Rubio led businessman Carlos Beruff in the GOP primary contest by close to 50 points.

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