WASHINGTON (AP) - Mitt Romney and Rick Santorum are trying to make the most of a mixed Super Tuesday, each claiming a measure of victory but unable to settle the most tumultuous race for the GOP presidential nomination in decades.

Romney narrowly won in pivotal Ohio, seized a home-state victory in Massachusetts, triumphed in Idaho, Vermont and Alaska, and won easily in Virginia - where neither Santorum nor Newt Gingrich was on the ballot.

Romney was forced to share the attention with Santorum, who won contests in Oklahoma, Tennessee and North Dakota.

The results padded Romney's delegate lead in the nomination fight, but they also refreshed questions about his appeal to conservatives in some of the most Republican states in the nation.