A sudden disruption in Washington has sent government shutdown probabilities skyrocketing, validating Professor Jeremy Siegel's latest warning that a once "done deal" has unraveled into a genuine market threat.The ‘Monkey Wrench’ In WashingtonIn his weekly commentary released Monday, Wharton Professor Siegel warned that Democrats have "thrown a monkey wrench" into budget negotiations, threatening a new government shutdown.While markets had previously priced this risk as negligible, sentiment has shifted vio ...