Hillary Clinton's campaign on Friday tried to frame the Brexit vote fallout as a leadership test, and the latest opportunity to paint Donald Trump as unfit for the Oval Office.But Democrats outside her campaign said the strength of the “Leave” bloc in economically frustrated regions of Britain — a shock after polls showed both sides equally positioned for a victory — could be a cause for concern at home, where economically struggling voters have also been energized by Trump's anti-immigrant, anti-establishment rhetoric.“There are some warning signs,” said former New Mexico Gov.