The Koch brothers' network of well-funded outside groups says it will spend millions to protect Republicans who oppose the party's health care bill from political fallout.Americans for Prosperity and Freedom Partners, the Koch network's big-budget grassroots activism and advertising groups, are teaming up to create a "seven-figure" reserve fund to support lawmakers who buck President Donald Trump and House Speaker Paul Ryan on the health care vote, as the threat of primaries looms over some opponents of the bill.