"If Romney sweeps February, the arc of his effort will be so strong... it will be over."

◼ Analysis: Romney Win Leaves Rivals Few Options - AP

Mitt Romney's big win in Nevada four days after his breakthrough victory in Florida spells big trouble for his remaining rivals. Simply put: Is there any way to stop Romney now?

There is no question now that Republicans have begun to coalesce around the former Massachusetts governor's candidacy in earnest. He swept nearly every voting group in Nevada including those that have been slow to come aboard, such as tea party activists and voters who describe themselves as extremely conservative....

A handful of states hold caucuses this week, including Maine, Minnesota and Colorado. Then comes a three-week lull until primaries on Feb. 28 in Arizona and Michigan, where Romney grew up and where his father served as governor.