Wsj Opinion: Potomac Watch

Four states go to the polls, including Wisconsin, where 13% of Republicans vote for Nikki Haley and 8% of Democrats say they're uncommitted. Does this signal weakness for Donald Trump and Joe Biden? Plus, the Badger State bans "Zuckerbucks," and a report on the IRS's expansion plans shows the agency struggling to hire as it tries to ramp up audits on the wealthy. Learn more about your ad choices. Visit megaphone.fm/adchoices