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Story summary
- Elon Musk, the U.S. billionaire, will spend at least $100 million to support Sen. Susan Collins in the Maine Senate race.
- Musk is also eyeing Senate contests in Michigan, Ohio, Alaska and Iowa while considering Texas, Georgia and North Carolina.
- The Maine race will involve about $400 million in ads, with challenger Troy Jackson raising $2 million in two days after nomination and holding a slight July poll lead over Collins.
