Hillary Clinton leads Donald Trump by seven points in a head to head match-up between the two candidates set to officially be declared the faces of their respective parties over the next several days.

According to a CNN poll, Clinton now tops Trump 49 percent to 42 percent. When Libertarian candidate Gary Johnson is added to the mix, Clinton still leads Trump by a comfortable 42 percent to 37 percent margin with a rising 13 percent for Johnson.

Green Party candidate Jill Stein manages five percent of the vote, though pollsters add support for both her and Johnson appears to come from among a group of voters who are less enthusiastic about going to the polls.

With the start of the Republican National Conventions set to commence and Democratic gathering just days away, researchers found little has changed in overall support for either of the two leading candidates over the last month.

Pollsters found Trump's official naming of Indiana Gov. Mike Pence as his running-mate and Clinton's endorsement by onetime chief party rival Bernie Sanders seems to have swayed more independent voters into backing the former first lady in a one on one battle with Trump.

Overall, Clinton has a four point likeability advantage (43 percent to 39 percent) over Trump, with 64 percent of voters also agreeing she has the "right experience" to be commander in chief, compared to just 32 percent for Trump

Trump's biggest advantage comes in the way voters envision him handling terrorist group ISIS and voters also prefer him on the issue of handling taxes.

Meanwhile, only 43 percent of respondents see Pence as an excellent or pretty good addition to the GOP ticket, below the majorities who said so in initial surveys following the announcement of Paul Ryan in 2012, Sarah Palin in 2008 or Dick Cheney in 2000.

The random sampling of 1,013 adults and 872 registered voters was conducted by telephone July 13 through 16, with questions about Pence being added a day after polling commenced.

Two other national polls released to coincide with the start of convention season also show Clinton leading by an average of 4.5 points.

In an ABC News/Washington Post poll of 816 registered voters taken from July 11-14, the former secretary of state tops Trump 47 percent to 43 percent.

A NBC News/Wall Street Journal poll of 1,000 voters with a margin of error of 3.1 points has Clinton up 46 percent to 41 percent.

All the polls were taken after Clinton was publicly blasted by FBI Director James Comey as being "extremely careless" in her use of a private e-mail server while serving with the State Department.

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