Photos: Super Tuesday, busiest day of the 2016 primary campaign

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Tess, a Basset Hound and Collie mix, looks up at voters as her owner Lindsay Greco, right, casts her ballot in the Georgia primary election at a polling site in a firehouse Tuesday, March 1, 2016, in Atlanta. (AP Photo/David Goldman) Tess, a Basset Hound and Collie mix, looks up at voters as her owner Lindsay Greco, right, casts her ballot in the Georgia primary election at a polling site in a firehouse Tuesday, March 1, 2016, in Atlanta. (AP Photo/David Goldman)

It’s the busiest day of the 2016 primary campaign, with a quarter of Americans having their say.