TOLEDO, Ohio (AP) — A relieved-sounding Mitt Romney hopes to parlay twin victories in Arizona and Michigan into Super Tuesday momentum as the GOP presidential race sweeps across 10 states at once next week. After falling short of a Michigan upset, rival Rick Santorum faces stiffer competition for the conservative vote as he moves into Newt Gingrich territory. Gingrich, the former U.S. House speaker from Georgia, is counting on Tuesday's Southern primaries to revive his campaign.