Billionaire David Koch, major conservative donor, dies at 79

WASHINGTON (AP) — Billionaire David Koch has died at age 79. Koch was a major donor to conservative causes and educational groups.His older brother, Charles, said on Friday, "It is with a heavy heart that I now must inform you of David's death."The Kochs were best known for a vast political network they built that became popularly known as the "Kochtopus" for its far-reaching tentacles in support of conservative causes.The brothers founded the anti-tax, small government group Americans for