Pres. Calvin Coolidge (MA) / Sen. Charles Curtis (KS) 56% 434Gov. Al Smith (NY) / Sen. Joseph Robinson (AR) 43% 97
Coolidge would perform better than Hoover in New England, retaining some of the Irish and other 'ethnic' community vote there even though most still do go for Smith. He does not quite as well in the Midwest due to the Central/Eastern European connection that Mecha mentioned, bleeding to Smith from progressives who would go for Hoover but find Coolidge too conservative, and Hoover originally hailing from that region. Coolidge has slightly less support in the South than Hoover, but basically Coolidge can hate the KKK all day long and they are still going to go out and support him over a Catholic except in the most extremely solidly Democratic parts of the Deep South.