Yahoo! Defense Sec. Robert Gates doesn’t often show his emotion, but you could tell he was just a little bit thrilled yesterday to share the news that it would be a “very serious mistake” to think President Obama wouldn’t veto the Defense Department’s spending bill just because it includes DADT’s compromised repeal. Like if it includes line items for the F-35 Joint Strike Fighter’s new engine and the C-17 transport vehicle (what, you don’t know what that is?). If the reconciliation committee that merges the Senate and House’s version of the spending bill doesn’t strike that funding, g’bye repeal?