[Joeri]

The US has such a large military budget that it acts like a war magnet. If there isn't a war once a decade there could be talk of reducing spending which would be harmful to all those special interests funding campaigns. So, basically an anti-war candidate is unelectable because they wouldn't get big money behind them. There are always anti-war candidates at the start, but they never make it to the final two because you need the right funding mix to get there.