A Fox News host was ambushed while attending her pal’s campaign event in Brooklyn Monday night — doused head to toe with a bottle of water. The assault against Kat Timpf, a libertarian co-host on “Fox News Specialists,” occurred at Union Pool in Williamsburg, where her friend and Brooklyn Borough president hopeful Ben Kissel was hosting the event, which coincided with his birthday. In a series of tweets, a shaken Timpf, 28, said the attack was targeted. An unknown guy “walks in, clearly here because he knows I’m here, dumps an entire 1.5 liter bottle of water on me, first...