Mitt Romney coasted to victory in the Arizona primary Tuesday night and vied with rival Rick Santorum for supremacy in Michigan in a Republican presidential race as unsettled as the day it began.

Preliminary results from exit polling in Arizona and Michigan suggest voters in each state made up their minds earlier than voters in previous contests. While voters remain focused on the economy, abortion and immigration are growing in importance.

Arizona Republicans go to the polls this week in what could be one of the least-watched races in the presidential primary.

Rick Santorum is looking for another upset or two, while Mitt Romney is hoping to keep his leading rival at bay in the run-up to the 20th debate of the race for the Republican presidential nomination.

Michigan is getting more attention from Republican presidential contenders than Arizona though both states share a Feb. 28 primary date and have virtually the same number of convention delegates, but that changes Wednesday, at least for a day.

Republican presidential candidate Rick Santorum has scheduled two public appearances in Arizona in addition to appearing in a debate to be held Feb. 22 in Mesa.

Some of the U.S. Census Bureau's 2010 Census data poses a puzzle. The Bureau found far fewer people in many major cities than its own estimates had found a year earlier. Now the Census Bureau and cities are debating which numbers are closer to the truth. No one knows for sure — and no one may ever know for sure.

The bleakest year in the foreclosure crisis has only just begun.

Attorneys for 20 states fighting the new federal health care law told a judge Thursday it will expand the government's powers in dangerous and unintended ways.

A coalition of 13 states has asked the U.S. Supreme Court to uphold an Arizona law penalizing businesses that knowingly hire illegal immigrants.