New polls released the day before Saturday's South Carolina's Republican primary has Arizona Sen. John McCain ahead of Mike Huckabee, but the margin depends on the poll.

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According to a MSNBC/McClatchy Newspaper survey, McCain has the support of 27 percent of those questioned. Huckabee was right behind at 25 percent. Mitt Romney is at 15 percent. Fred Thompson is at 13 percent.

McCain leads Huckabee among those who most value strength and leadership, while Huckabee leads McCain among those who want a candidate who shares their values. McCain led among independents, 40 percent to 22 percent, and Huckabee led among born-again Christians, 33 percent to 20 percent.

A Fox News/Opinion Dynamics poll has McCain holding a 27 percent to 20 percent lead over Huckabee, the former governor of Arkansas. Romney, the former governor of Massachusetts, was in third place with 15 percent, followed by Fred Thompson at 11 percent.

The Fox News poll found that one in five South Carolina Republicans said they are still undecided. They named the economy as the campaign's top issue, and those who did preferred McCain. Immigration, homeland security and the war in Iraq were also highly ranked.

About half say they would like to deport as many illegal immigrants as possible, but no single candidate has an advantage with this group. Four in 10 consider it important to share religious beliefs with their candidate, and McCain and Huckabee do well with them while Romney does poorly. The state's military households lean toward McCain.

Polls show that Nevada, which has Democratic and Republican caucuses on Saturday as well, is being led by Sen. Hillary Rodham Clinton on the Democratic side, and Romney among Republicans in a poll conducted by Mason-Dixon Polling.

Clinton is polling at 41 percent, ahead of Sen. Barack Obama's 32 percent. John Edwards is at 14 percent, and 10 percent is undecided.

Racial, ethnic and gender divisions are apparent in the Democratic race, where Clinton leads Obama 49 percent to 28 percent among women and 50 percent to 29 percent among Hispanics.

Obama leads Clinton 65 percent to 18 percent among blacks. The two candidates split the support of men almost evenly -- 37 percent for Obama, 30 percent for Clinton.

Polling has Romney with a 34 percent to 19 percent lead over McCain, with Huckabee at 13 percent, Thompson at 8 percent and Giuliani at 6 percent, with 11 percent undecided.

In the GOP race, Romney, a Mormon, is holding his own against Huckabee, a former Baptist minister, for the support of voters who describe themselves as "born again" - 23 percent and 28 percent, respectively. Huckabee was propelled to a first place finish in Iowa's Republican caucuses on Jan. 3 by strong support from conservative religious voters.

Obama Leads South Carolina

South Carolina Democrats go to the poll Jan. 26 and the MSNBC/McClatchy poll has Obama with the backing of 40 percent of those questioned. Clinton is at 31 percent. Edwards is at 13 percent.

Among Democrats, Obama led Clinton among black voters, 56 percent to 25 percent, while Clinton led among whites, 39 percent to 20 percent. Obama had more support from male voters, while Obama and Clinton were competitive among women.