Donald Trump and Bernie Sanders, both thought of at one point as fringe candidates, are now the frontrunners in Iowa for their respective parties, according to a new poll conducted by CNN/ORC.

The poll shows Sanders ahead of Hillary Clinton by eight points, while Trump has an eleven point advantage over his Republican rival, Ted Cruz, placing them at 37 percent to 26 percent.

Republican Senator Marco Rubio is trailing the Republican frontrunners, putting him in third place in the poll at 14 percent.

Yet when looking only at the voters who participated in the respective party's last caucus, the numbers tell a different story.

Among Republicans who participated in the most recent caucus, Trump only leads Cruz by two percentage points.

Among Democrats who took part in the 2008 caucus, Clinton has a 55 percent to 38 percent lead over Sanders.

CNN's poll is especially significant for Sanders, as previous polls showed Clinton slightly ahead of Sanders among Iowa's voters.

A poll conducted by Monmouth/KBUR contradicts the findings of CNN's poll, and still has Clinton leading Sanders by seven percentage points, reflecting the pattern that has been observed thus far in the primary process.

If CNN's poll proves to be accurate, however, a win for Sanders in Iowa, followed by one in New Hampshire, where he has held a steady lead, would be extremely beneficial to Sanders' campaign.

These wins would make Sanders' a more "credible" candidate, according to an article published in the Wall Street Journal.

The polls cannot definitively state which candidates will be victorious in Iowa, so anticipation will only build until the February 1st caucuses.

Reach staff reporter Aden MacMillan here.