FACTBOX: Obama and Huckabee on key issues

(Reuters) - Barack Obama won the most support from Democratic voters in Iowa on Thursday while Mike Huckabee won the Republican contest, putting both men closer to winning their parties' nomination for U.S. president.

Here are the two candidates' positions on several key issues in the campaign:

IRAQ

Huckabee: Opposes setting a timetable for troop withdrawal and says the "surge" in U.S. troops in Iraq helps foster reconciliation among Iraqis. He has criticized the Bush administration's foreign policy for an "arrogant bunker mentality".

Obama: Wants to begin immediately withdrawing one or two brigades a month and have all troops out within 16 months; would call a U.N.-led constitutional convention in Iraq that would not adjourn until reconciliation reached; aims to refocus energies on al Qaeda threat in Afghanistan and Pakistan;

IMMIGRATION

Huckabee: Opposes granting amnesty to illegal immigrants or granting driver's licenses to them; says those caught illegally entering the United States must be detained, processed and deported;

Obama: backs boosting the number of immigrants allowed in the United States; would permit undocumented workers to pay a fine, go to the end of the line for citizenship and learn English in order to stay in the country; would add personnel and technology to protect the U.S. borders.

HOUSING CRISIS