Victor dropped out of the Arizona Senate race and endorsed Masters, giving Masters a boost in his race against incumbent Democratic Sen. Mark Kelly.
He said he is very confident. A 30-minute endorsement video featuring an interview with Masters was released Tuesday.
The New York Times reported that Democratic groups helped fund Victor's campaign in an effort to get votes from Masters.
According to FiveThirtyEight, Masters has made a comeback in the polls against Kelly and now trails him by just three points.
The Masters/Kelly race is one of several pivotal Senate contests that have swung toward Republicans in recent weeks. The Cook Political Report shifted the race from toss-up to lean Democrat a month ago. According to FiveThirtyEight, the Republicans have a 50% chance of changing the balance of power in the Senate. There was a 29% chance that Republicans would win the majority in September. The changing Senate forecasts are due to voters' concerns about the economy and crime. Economic issues were the top concern for the majority of likely Arizona voters, according to a Times/Siena poll. More voters said they preferred the Republicans to control the Senate than the Democrats.
More than $2 million. The amount of money was spent on ads for Masters.
The Democratic Senatorial Campaign Committee and the Kelly campaign placed their first coordinated ad buy in the race on Monday, purchasing $191,000 in broadcast spots that began airing Wednesday.
Billions of dollars are spent in the key Senate races by Trump-linked super PACs.
Senate forecasts have moved toward Republicans in the final stretch before the election.
More voters trust Republicans than Democrats to handle the issue of the economy.