Ben Carson seems to be gaining more favor, but he's still behind Donald Trump in the 2016 presidential race, according to a new NBC/Wall Street Journal poll.

The NBC/WSJ poll was conducted from Sept. 20 to 24, and it surveyed 256 Democratic voters and 230 Republican primary voters, with a margin of error of +/- 6.1 percentage points and +/- 6.5 percentage points, respectively.

According to the poll results, which were released last Sunday, Trump is still leading the GOP race, garnering 21 percent of Republican primary voters' support across the states, but Carson is close behind with 20 percent.

In the prior weeks, Trump was clearly leading, but Carson has steadily crept up since Trump only showed an average performance in this month's second Republican debate, NY Daily News reported.

The results also showed that former Hewlett-Packard CEO Carly Fiorina is already tied with Marco Rubio in the third place, with 11 percent support, while Florida's Jeb Bush is in fourth place with seven percent.

Over to the Democratic side, the poll also revealed head-to-head results with Senator Bernie Sanders also closing in on Hillary Clinton in the latest NBC/WSJ poll.

The former secretary of state seems to be losing her support as Sanders is now behind her with only a seven-point gap.

The seven-point gap only shows that Clinton's support has gone down significantly from the previous months.

Back in July, Clinton was ahead of Sanders by 34 percentage points and in June, she led by a massive 60 percentage points.

In the latest poll, Clinton garnered 42 percent support from the people polled, while Sanders got 35 percent.

Vice President Joe Biden, on the other hand, got 17 percent, but he still has to decide if he'll run for president next year.

If Biden won't run next year, pollsters were asked who their second choice would be and a majority responded that it would be Clinton. Without the vice president, Clinton's lead against Sanders grows by 15 percentage points.