The latest 2016 presidential poll shows Hillary Clinton continuing to dominate both the Democratic and GOP field.
Ninety-two percent of Democrats and Democratic-leaning independents told NBC-Wall Street Journal pollsters they could see themselves supporting Clinton, up from 86 percent who said the same in March.
Vermont independent Sen. Bernie Sanders is still gaining in popularity though. Forty percent of respondents said they could see themselves voting for him, up from 21 percent in March.
Among only Democratic primary voters, 75 percent said their first choice would be Clinton. Sanders was her closest challenger, receiving support from 15 percent. Former Virginia Sen. Jim Webb and former Maryland Gov. Martin O'Malley received support from less than 5 percent of respondents.
NBC offered a cautionary note about Clinton's leads: "Sixty-two percent of Democratic primary voters want her to have a challenging primary to test her for the general election, signaling they don't want a coronation to the nomination."
Clinton also fared better than her GOP rivals in a hypothetical matchup among registered voters, beating out former Florida Gov. Jeb Bush 48-40 percent, Wisconsin Gov. Scott Walker 51-37 percent and Florida Sen. Marco Rubio 50-40 percent.
As for the Republican field, Bush led the pack with 75 percent support from Republicans and Republican-leaning independents. Seventy-four percent said they could see themselves supporting Rubio, while former Arkansas Gov. Mike Huckabee garnered 65 percent support and Walker 57 percent. Former Texas Gov. Rick Perry rounded out the GOP's top five with 53 percent.
Respondents were also asked which issues are of most concern in the upcoming election.
Thirty-three percent said they were most concerned that "wealthy individuals and corporations will have too much influence over who wins," while 25 percent said they thought "too much of the campaign will be spent on negative attacks rather than proposing solutions." Sixteen percent said they believe "nothing will really change, no matter who wins."
The poll was conducted June 14-18 among 1,000 adults and has an overall margin of error of plus or minus 3.1 percentage points.
