Rebel fighters near Ras Lanuf, LibyaIs President Obama dithering over Libya?In the past week or so, a diverse array of commentators—Republican hawks, the usual neocons, and some normally gun-shy Democrats, including Sen. John Kerry—has called on Obama to take action now. Some have charged Obama with queasiness or lack of principles for not charging the ramparts from the get-go. But one can imagine several very good reasons for the president's … let's call it caution.