The four objects are always in alphabetical order.
One object in each set isn't like the others in some essential way.

jupiter, mars, MOON, venus (planets)
australia, brazil, ICELAND, south africa (southern hemisphere)
mariners, NETS, orioles, red sox (baseball teams)
broccoli, carrots, lettuce, ORANGES (vegetables)
batman, flash, RIDDLER, superman (superheroes)
canada, ITALY, uk, usa (countries where English is spoken)
jack, king, queen, THREE (face cards)
green, orange, purple, YELLOW (secondary colors)
bellingham, PORTLAND, seattle, walla walla (washington state cities)
AMAZON, facebook, tumblr, twitter (social sites)
blair, churchill, REAGAN, thatcher (UK politicians)
ant, mosquito, TARANTULA, wasp (insects)
illinois, st. james, ventnor, YESLER (streets on a monopoly board)

MINORITY PARTY