Ted can't quit. He's made too many promises to too many billionaires in the Republican Political Class. There's a LOT of money at stake on Ted's campaign. His globalist supporters like Goldman Sachs, Club for Growth, etc., etc., expect TPP, more "free trade" agreements like NAFTA (which were Heidi's specialty as adviser to GWB under Robert Zoellrick, pres of World Bank, then Goldman Sachs), more immigrants and more cheap labor and to make DAMN sure there's no wall or nor the flow of cheap labor impeded, and Silicon Valley and others who want unlimited STEM workers (which is why Cruz already proposed 500,000 ADDITIONAL H-1B visas; TPP opens our borders to workers from every signatory country with no limit. TPA, which Ted voted for, is to fast track, allowing these "free trade" agreements to be implemented unimpeded by US legislators or citizens.)
There's never been an election with so much money at stake---the entire existence of the Washington Political Class, its donors and lobbyists, the very trough of plunder from which the 1%, the crony capitalists, and the Uniparty feed from.