While Bush himself hasnt yet settled on endorsing Rubio, those close to the former governor whose relationship with the senator had grown tense in his campaigns final weeks expect him to get there. If he does endorse, Rubio would be expected to land the support of still-uncommitted Bush family loyalists like Jack Oliver, a veteran Republican Party fundraiser.
To some in the GOP leadership, Bushs exit from the contest has reignited hopes that a fractured party establishment will eventually unite. Still, eating into Rubios vote share is John Kasich, a moderate Ohio governor who is charting a course through the Midwest if he survives long enough to contest primaries like Michigans, to be held on March 8.
One senior party operative on Monday evening described building irritation with Kasich among GOP elders for staying in the race when has such a narrow path to the nomination but said there was no consensus on the best way to force him out.
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To dislodge Trump, though, Rubio must first defeat another rival: Cruz. People briefed on Rubios game plan say hes planning to launch an all-out assault on the Texas senator, labeling him as a dishonest figure while appealing to evangelicals, a group that Cruz had been counting on a strategy Rubio used with success in South Carolina. Watch Rubio go nuclear on Cruz, one source briefed on the plans said.
If Rubio is able to go after Cruz effectively, many in the party hierarchy envision the makings of a one-on-one race. They are hopeful that Cruz will find himself stretched by fighting a two-front war against Trump and Rubio, both of whom have targeted the Texas senator in recent days and who are likely to do so in Thursdays GOP debate.
Cruz now strikes me as the candidate in the most vulnerable position, because his outsider message is being drowned out by Trump and his core constituency evangelicals dont seem any more drawn to him than they are to Trump or Rubio, said Steven Law, the president and CEO of American Crossroads, a prominent Republican group founded by Karl Rove.