After each mass shooting, gun control activists, bereaved parents and lawmakers reissue a call for more restrictive gun control laws. However, eight years after the shooting at Virginia Tech University that killed 32 and two years after the massacre at Sandy Hook Elementary that left 27 dead, meaningful legislative changes have not come to pass.

The latest mass shooting in Oregon on Thursday again raises the issue of gun control and why efforts to pass gun law reforms have failed

A simple reason is, perhaps, money. In 2015, the gun rights lobby outspent the gun control lobby about 6 to 1.

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The gun rights lobby has outspent the gun control lobby 6 to 1 in 2015