The charts above are from the latest Fox News Poll -- done between May 31st and June 2nd of a random national sample of 1,006 registered voters, with a margin of error of 3 points (no margin of error for only Democrats or Republicans was given).
As usual, it shows the Republican race is still extremely tight -- with no candidate getting more than 13% support.
I was a little surprised they included Elizabeth Warren and Andrew Cuomo in the Democratic poll, since Warren has made it very clear she is not a candidate and Cuomo has made no serious attempt at being considered a candidate. I suspect it was just to split up the liberal vote, but it doesn't matter. Hillary Clinton still has a substantial majority of the vote (59% of Democrats and 54% of liberals).
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A new survey of Iowa Republicans and Democrats was also released. It is the Gravis Marketing Poll, and it was done on May 28th and 29th of 364 Republicans and 434 Democrats. The margin of error was 5 points for each party. The results of that survey are illustrated in the charts below.