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— In their efforts to derail Donald Trump from the Republican presidential nomination, Texas Sen. Ted Cruz, Florida Sen. Marco Rubio and Ohio Gov. John Kasich are all facing enormous pressure in their home state primaries, which account for about a fourth of the delegates up for grabs in the next three weeks.

Failure to defend their turf could leave each explaining what states they can win going forward — and make the New York billionaire look all the more inevitable.

After Trump’s lopsided win in Nevada, the presidential race now shifts to a dozen states on Super Tuesday. That includes Texas, with 155 delegates — the biggest prize of any contest that day.

Another test looms March 15, with primaries in Florida, with 99 delegates, and Ohio with 66 — those states are winner-take-all.

If no one can dent Trump’s advantage by then, the race for the nomination may be all but over. But home states have buoyed candidates in the past. Four years ago, eventual GOP nominee Mitt Romney used his native Michigan to quash a surprisingly stout challenge from Rick Santorum. Newt Gingrich won his home state of Georgia and neighboring South Carolina but did little elsewhere.

Of the trio with looming home-state primaries, Cruz may be in the strongest position. “I wanna say, I cannot wait to get home to the great state of Texas,” Cruz said Tuesday night after losing in Nevada to Trump.

But Cruz will have to win more than just Texas on Tuesday if he doesn’t want to be looking up at Trump in the delegate count.

Kasich and Rubio, meanwhile, may be battling for many of the same votes from traditional Republicans uneasy with the bombastic Trump and the firebrand conservative Cruz. As long as both remain in the race, they could continue to split the establishment bloc. And they’ll have to run Tuesday’s gantlet before they can even reach must-wins at home.

The home-state jockeying is underway.

Florida

Current and former members of Congress from Florida who had been backing Jeb Bush signed on with Rubio this week after the ex-governor left the race. That’s not to say Rubio’s a slam dunk in his state.

Trump is the only Republican still in the race who had an obvious campaign presence in Florida — office space and paid employees on the ground — as of late last month. Trump is a part-time resident. Bush also was building a Florida operation and some of that may flow to Rubio.

“Now that Jeb is out of the race, that helps Marco tremendously,” said Marcelo Llorente, a former Republican legislator in Florida who knows both men well.

Cruz strategist Jason Johnson released a memo arguing that if Rubio’s hopes are built around winning Florida, that won’t work because almost half of the delegates needed to win the nomination will have been awarded by then. But Johnson’s agument presumes Rubio won’t do well Super Tuesday.

Texas

Cruz has spent more time in the South than his rivals and built networks of supporters he hopes can not only help him in Texas but also nearby states. That approach did not work in South Carolina, the only Southern state where it has been tested.

The Texas senator has for years been considered his state’s most popular politician, and Gov. Greg Abbott, his friend, mentor and ex-boss, endorsed him on Wednesday.

Cruz also has the backing of former Texas Gov. Rick Perry and current Lt. Gov. Dan Patrick, along with nearly one-fourth of the Republicans representing Texas in Congress and about half of the Republicans in the state Legislature. He’s also built a strong ground game, boasting 27,000 volunteers, but a similarly strong organization didn’t spell victory in South Carolina.

Polls suggest Cruz is the favorite in Texas.

“He’s a native-son candidate,” GOP strategist Matt Mackowiak said. “Support for him is very strong.”

Ohio

Kasich is looking to the Midwest and Michigan’s March 8 primary to help carry him through to his neighboring home state a week later.

A new Quinnipiac survey has Kasich lagging Trump but within 5 percentage points of him, marking progress for the governor.

Kasich brushes off any notion he may not win his state. Ben Carson, a Detroit native, is also trying to reinvigorate his campaign for the Republican presidential nomination. Carson, a retired neurosurgeon who is hovering near the bottom of the GOP field, is holding out hope that voters will come his way as the Michigan primary approaches.

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