Republican Mitt Romney cruised to an easy victory over top rival Rick Santorum in Illinois.

Mitt Romney could take a leap toward finishing off chief rival Rick Santorum and seize command of the race for the Republican ticket on Super Tuesday.

After cleaning up in Arizona, Mitt Romney has won the Republican primary in his home state of Michigan, after a tight race with rival Rick Santorum.

Many US Republicans may have growing concerns about their presidential front-runner Mitt Romney but no one is pushing the panic button — yet.