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Jennifer Duffy, who covers Senate races for the Cook Political Report, thinks a runoff is highly likely. But she said it’s too early to tell who would have the advantage in a runoff. Much depends on whom the losing seven candidates would support. And with the intraparty battle extended for more than two months, more outside money may flood into — and influence — the race.

Added Ms. Duffy; “Don’t underestimate Dewhurst’s ability to get voters out.”