Trump shifts his attention to surging Biden, lays off Sanders

President Donald Trump’s political operation is shifting its focus to apparent Democratic frontrunner Joe Biden — and ramping up its efforts to convince Bernie Sanders’ supporters he's being robbed of the nomination.

With Biden suddenly vaulting to the front of the Democratic pack with his array of Super Tuesday wins, Republicans are intensifying their attacks on the 77-year-old former vice president. It represents a dramatic reversal: As late as last week, many in Trump’s circle were certain that Sanders would be their general election opponent and had all but written...