Mitt Romney opened his campaign Friday for Wisconsin’s Republican presidential primary as though victory were a foregone conclusion.

Ignoring his GOP rivals, Romney arrived here in the Fox Valley with his latest in a string of high-profile supporters announcing endorsements: Rep. Paul D. Ryan, one of Wisconsin’s best-known if controversial Republicans.

The message, delivered explicitly by Ryan on Fox News: It’s time for the party to close ranks behind Romney and join the fight to oust President Obama.

For months, Romney has periodically ceased attacking GOP rivals when the threat of an upset seems to recede, only to resume after another setback. Three independent polls this week have found Romney holding an edge over Rick Santorum in Wisconsin, with former House Speaker Newt Gingrich and Rep. Ron Paul of Texas running far behind. So on Friday, Romney had his eyes on the fall contest.

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