Leading Democratic presidential bet Hillary Clinton will lose in the key swing states of Colorado, Iowa and Virginia if the Nov. 8, 2016 election was held today, according to a new poll.

Quinnipiac University Swing State Poll released its results Wednesday showing Clinton behind every matchup with Republican bets Sen. Marco Rubio of Florida, former Florida Gov. Jeb Bush and Wisconsin Gov. Scott Walker in the three states, which have a total of 28 electoral votes, Fox News wrote.

In Colorado, voters picked Rubio with 46 percent over Clinton with 38 percent. In Iowa, 44 percent chose Rubio against Clinton who got 36 percent. In Virginia, 46 percent of voters went to Rubio against Clinton's 41 percent.

Pitted against Bush, Clinton got 36 percent against Bush's 41 percent in Colorado; 36 percent against 42 percent in Iowa and 39 percent against Bush's 42 percent in Virginia.

Clinton trailed Walker in Colorado, 38 percent to 47 percent; 37 percent against 45 percent in Iowa; and 40 percent against 43 percent in Virginia.

The poll said Clinton got negative favourability ratings in each state, 35-56 percent in Colorado, 33-56 percent in Iowa and 41-50 percent in Virginia.

"Hillary Clinton's numbers have dropped among voters in the key swing states of Colorado, Iowa and Virginia. She has lost ground in the horserace and on key questions about her honesty and leadership," said Peter Brown, assistant director of the Quinnipiac University Poll.

Against the three Republicans, "Clinton trailed in six matchups and is on the down side of too-close-to call in three," Brown said.

In the last 10 presidential elections from 1976 to 2012, Colorado voted Republican except in 1992, 2008 and 2012, the last two of which were won by President Barack Obama.

Iowa voted Republican in four of the last 10 elections while Virginia voted for Republican in eight of the last 10 elections except in 2008 and 2012.

Surprisingly, Republican presidential candidate Donald Trump—who reportedly leads the GOP presidential race in some recent polls—is described as the "biggest loser" in the poll having the worst favourability ratings among the candidates, with roughly two out of three voters in each state rejecting him. Trump got 31-58 (favourable-unfavourable) percent in Colorado, 32-57 percent in Iowa and 32-61 percent in Virginia.

Brown said Trump "stands out for the wrong reason" among the 17 candidates for the Republican presidential nomination.

"His large negative favourability rating means his growth potential is not as attractive as his competitors," he said.

The poll was conducted from July 9-20 among 1,231 Colorado voters, 1,236 Iowa voters and 1,209 Virginia voters with a margin of error of +/-2.8 percentage points.