Republican presidential candidate Donald Trump speaks to supporters in Palm Beach, Fla.

Republican presidential candidate Donald Trump speaks to supporters in Palm Beach, Fla. Gerald Herbert/AP

Trump's Very Super Tuesday

Even as he faces growing resistance from Republican party leaders, Trump is growing his support with Republican voters.

PALM BEACH, Fla.— If it wasn’t already clear, last night’s res­ults un­der­scored that Don­ald Trump is a Te­flon can­did­ate who draws strength from the kind of con­tro­versy that would end most nor­mal cam­paigns. The fren­zied protests last week­end that led to Trump can­cel­ling a Chica­go rally only helped Trump build on his sup­port from a dis­af­fected Re­pub­lic­an elect­or­ate.  His clashes with the me­dia are win­ning him sup­port from con­ser­vat­ive voters who nev­er trus­ted the press in the first place.  His aver­sion to facts and de­tails are ir­rel­ev­ant to Re­pub­lic­ans who want strength and bluster from their stand­ard-bear­er.

In­deed, Trump went a long way in se­cur­ing the Re­pub­lic­an nom­in­a­tion Tues­day night, slowly ex­pand­ing his sup­port with­in the Re­pub­lic­an party even as GOP res­ist­ance against him is in­tensi­fy­ing. He won 46 per­cent of the vote in Marco Ru­bio’s home state of Flor­ida, des­pite anti-Trump out­side groups sat­ur­at­ing the air­waves there with over $10 mil­lion in scath­ing anti-Trump at­tack ads. He nearly hit 40 per­cent in Illinois, win­ning com­fort­ably in the af­flu­ent Chica­go­land sub­urbs where his rivals’ mes­sage seemed a bet­ter fit. Even his lone loss in Ohio was something of a mor­al vic­tory: He tal­lied 36 per­cent of the vote in a state where Ohio Gov. John Kasich scores sky-high ap­prov­al rat­ings.

For Trump, the name of the game is still win­ning a ma­jor­ity of del­eg­ates to avoid a con­tested con­ven­tion, a task that re­mains chal­len­ging. He needs to win about 55 per­cent of the re­main­ing del­eg­ates to hit the ma­gic 1,237 num­ber; my Cook Polit­ic­al Re­port col­league Dave Wasser­man cal­cu­lated he won about 67 per­cent of avail­able del­eg­ates last night. But equally im­port­ant, he shattered the no­tion of wide­spread GOP voter res­ist­ance, demon­strat­ing a geo­graph­ic and ideo­lo­gic­al breadth of sup­port that will make him tough to beat in many of the re­main­ing states, even with a con­sol­id­ated field.

In Flor­ida, Trump won an out­right ma­jor­ity of the vote in af­flu­ent Palm Beach and Broward Counties, ad­ja­cent to Ru­bio’s home base in Miami-Dade. This, in a closed primary lim­ited to re­gistered Re­pub­lic­ans. Two nights be­fore the primary, Trump packed over 6,000 fans in­to an am­phi­theat­er in Boca Raton, wow­ing his sup­port­ers when Air Force Trump ar­rived in the skies above. The crowd was filled with self-de­scribed mod­er­ate Re­pub­lic­ans, many of whom backed Obama in 2008 but long since turned against the pres­id­ent. Trump was their new avatar of hope and change, a politi­cian of strength to counter Obama’s weak­ness.

“He’s say­ing what a lot of Amer­ic­ans have been think­ing for a long time,” said Car­ol Fish­er, a former Jeb Bush sup­port­er from Delray Beach who said she usu­ally backs the “es­tab­lish­ment” can­did­ates by de­fault. “The more I heard him, the more I real­ized I agreed ex­actly with what he was say­ing.”

Des­pite the heated protests against Trump that forced the busi­ness­man to can­cel his Chica­go rally, he per­formed bet­ter in Illinois than he did in neigh­bor­ing Michigan. In Obama’s home state, Trump won 40 per­cent of the wealth­i­est Illinois voters, re­ceived 31 per­cent of the vote from col­lege gradu­ates, and swept 41 per­cent of the mod­er­ate GOP vote. The Chica­go sub­urbs that looked like a haven for Ru­bio and Kasich turned in­to Trump coun­try.

There are signs that Trump would have rocked Ohio too if Kasich wasn’t in the race. Even in a loss, he con­sist­ently car­ried around 35 per­cent of the vote in the Clev­e­land and Cin­cin­nati sub­urbs, a healthy total giv­en Kasich’s home field ad­vant­age. Exit polls showed Trump beat­ing Ted Cruz in a one-on-one match­up, 44 to 39 per­cent, a clear sign that Cruz is hardly a fron­trun­ner if the field is nar­rowed to just two Re­pub­lic­ans. In fact, the anti-Trump Re­pub­lic­ans prob­ably need a strengthened Kasich to dent Trump’s sup­port in many re­main­ing Mid­west­ern and North­east­ern states, where Cruz is a non-factor.

Out­side of Ohio, the main sil­ver lin­ings for the anti-Trump move­ment came in Mis­souri, where Ted Cruz ral­lied evan­gel­ic­al sup­port to come with­in 2,000 votes of Trump and in North Car­o­lina, where Cruz’s strong show­ing in the sub­urbs demon­strated con­ser­vat­ive res­ist­ance to the fron­trun­ner. His weak­ness with Re­pub­lic­an wo­men is also a glar­ing red flag go­ing for­ward, as he only won their vote in two of the five states (Flor­ida and Illinois). A power­ful ad fea­tur­ing wo­men read­ing lewd Trump quotes prob­ably made a small im­pact, and is all but cer­tain to be re­vived by Demo­crats if Trump is the GOP nom­in­ee.

But at this point, the only can­did­ate that can real­ist­ic­ally win the nom­in­a­tion out­right is Trump. Circle two dates on the cal­en­dar to de­term­ine if he’s on a path to do­ing so: April 5, when Gov. Scott Walk­er will be­come the face of the anti-Trump move­ment in Wis­con­sin and April 26, when five North­east­ern states head to the polls. If Trump can pair his South­ern dom­in­ance with a Mid­west­ern near-sweep in three weeks, he will be hard to stop. These races will of­fer a test of wheth­er Cruz can ex­pand his sup­port out­side his com­fort zone and wheth­er Kasich can par­lay his home-state vic­tory in­to mo­mentum along the I-95 cor­ridor and in the Rust Belt.

The math to a del­eg­ate ma­jor­ity is still chal­len­ging for Trump, but he demon­strated he’s cap­able of grow­ing his sup­port even in the face of grow­ing res­ist­ance from rank-and-file mem­bers in his own party . Between 30 and 40 per­cent of Re­pub­lic­an voters said they’d con­sider vot­ing for a third-party can­did­ate if Trump is the nom­in­ee, ac­cord­ing to exit polls. But un­less Cruz or Kasich can tally some ac­tu­al vic­tor­ies in the com­ing month, the Trump train is look­ing harder to stop.