The two Democratic candidates may have kept a grip on their key constituencies in Tuesday's primary contests, but record support from one of Barack Obama's key stongholds -- African-American voters -- catapulted him to a big win in North Carolina, and a close second in Indiana.

According to FOX News exit polling, Obama won 91 percent of the black vote in North Carolina, which made up 33 percent of the electorate. He did equally well with black women and men, no less than 90 percent each.

On the other hand, Hillary Clinton kept a firm grip among whites in both states, but the margins were not enough to overcome Obama's surge.

In Indiana, white men went for Clinton 58 percent to 42 percent for Obama. In North Carolina, she won 54 percent of white men to 40 percent for Obama.

Among white women, which made up 34 percent of the North Carolina vote, Clinton won 64 to 32 percent.

While Obama began his campaign last year with the intent of not making race an issue, it has certainly become one. Aside from the racial gap in the demographics, the issue of the Obama's controversial pastor made an impact on the results on Tuesday, according to the polling.

Polls show that 30 percent of voters in the Indiana primaries said the issue of Rev. Jeremiah Wright was "very important" to their vote, while 18 percent said it was "somewhat important," and of those voters combined, 69 percent voted for Hillary Clinton.

In North Carolina, 33 percent said Wright was "very important" to their vote, while 15 percent said it was "somewhat important," and 62 percent of those two groups combined went with Clinton.

Despite this, Only 16 percent of Indiana voters said that race played an important role in their vote today, and of them, 57 percent said they went for Clinton, while 43 percent went for Obama.

For voters in both states, however, the economy was the biggest issue on their minds. In Indiana, 65 percent said the economy was their top issue in deciding their vote, and 54 percent of them went for Clinton compared to 45 percent for Obama. Meanwhile, 60 percent of voters in North Carolina said the economy was their top issue, and 52 percent of them went for Obama, 44 percent for Clinton.

In Indiana, 46 percent said their family has been affected “a great deal” by current economic conditions, and 53 percent of them voted for Clinton, while 47 percent went for Obama. In North Carolina, 37 percent said their family was affected “a great deal” by the economy, and 62 percent of them went for Obama, while 36 percent of them went for Clinton.

The trend linking Clinton with white voters with no college degree seemed to continue in Indiana, according to the polls. In Indiana, 65 percent of these voters went for Clinton, 34 percent for Obama. In North Carolina, 67 percent of these voters went for Clinton, 26 percent for Obama.

In North Carolina, college-educated voters went for Obama over Clinton 55 percent to 42 percent.

As for lower-income voters in Indiana, those making less than $50,000 a year supported Clinton by 51 percent, while 48 percent went for Obama.

But Clinton also won among higher-income voters, besting Obama 51 percent to 48 percent among those making more than $50,000.

As in previous primary contests throughout the country, older voters went hard for Clinton. In Indiana, 71 percent of senior citizens went for Clinton, while 29 percent went for Obama.

But Obama showed impressive numbers with the under-30 crowd -- 71 percent of them in North Carolina went for him over Clinton.

Obama also won among new primary voters -- which constituted 21 percent of the vote in Indiana, according to polls, 59 percent to 41 percent.

Also in line with previous primaries, Obama emerged the more "trustworthy" of the two candidates, at least in Indiana. Of those voters, 66 percent said he is honest and trustworthy, while 54 percent said the same for Clinton. Of the voters who said Clinton was not trustworthy or honest, however, 25 percent still voted for her.

Meanwhile, 62 percent of voters said Clinton "shares their values," while 65 percent said Obama shares theirs. In North Carolina, 69 percent said Obama shares their values, while 60 percent said the same about Clinton.

Republicans who were able to vote in the Indiana contests went for Clinton 52 percent to 46 percent for Obama, while independents, according to the polling, went for Obama 51 percent to 49 percent.

Looking toward the general election, an equal number of Indiana voters -- 48 percent -- say they believe Clinton or Obama can beat Republican John McCain in the fall. In North Carolina, 54 percent said Obama can beat McCain, while 40 said the same about Clinton.

Click here to read Indiana exit polling data.

Click here to read North Carolina exit polling data.