Zaid Jilani covered a study on voting patterns in Congress:

• The United States employed a draft in four conflicts: World War I, World War II, the Korean War, and the Vietnam war.
• A study found that if members of Congress had draft-age sons they were up to 17% less likely to vote as “hawks” – those more willing to risk war.
• Legislators that only had daughters of a similar age were more likely to be hawkish.
• The observed relationship was robust – as strong as 70% of the “party line” effect – where legislators are more likely to vote for a policy if it comes from a President from their own party.
• There are benefits to suing for peace – legislators that had draft-age sons were more likely to get re-elected.

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