New Jersey Gov. Chris Christie is the top choice of Republicans if the party nominates its presidential candidate at a "brokered" convention this summer, according to a Quinnipiac University national poll released Wednesday. Mr. Christie is favored by 32 percent of Republicans, followed by former Govs. Sarah Palin of Alaska and Jeb Bush of Florida with 20 percent each, the poll found. Indiana Gov. Mitch Daniels is fourth at 15 percent. Some conservatives are contemplating a so-called brokered Republican National Convention in Tampa, Fla., in August, in which none of the current candidates would have gained enough delegates to win...