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Still, Mr. Jindal, who was born in Baton Rouge to parents freshly arrived from the India’s Punjab state, could help counter Mr. Obama’s draw as the first minority on a major-party presidential ticket. He also might help quell dissent among conservatives: A pro-life Roman Catholic, he opposes embryonic stem-cell research and abortion.

Among other guests expected are Sens. Joe Lieberman, Connecticut independent, and Lindsey Graham, South Carolina Republican. Another governor often mentioned as a front-runner will not be there this weekend: Tim Pawlenty of Minnesota has a wedding to attend Saturday.