Retired astronaut Mark Kelly (D) leads Sen. Martha McSally Martha Elizabeth McSallySenate Republicans face tough decision on replacing Ginsburg Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy What Senate Republicans have said about election-year Supreme Court vacancies MORE (R) in the race for an Arizona seat in the United States Senate, according to a new poll.

The poll conducted by OH Predictive Insights, a Phoenix-based polling firm, shows Kelly scoring 49 percent of the vote among Arizona voters, compared with 42 percent for McSally.

Kelly led McSally by a narrower margin, 47 to 44 percent, in the firm's December poll.

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McSally, who was appointed to the seat by Gov. Doug Ducey (R) after the death of Sen. John McCain John Sidney McCainMcSally says current Senate should vote on Trump nominee Say what you will about the presidential candidates, as long as it isn't 'They're too old' The electoral reality that the media ignores MORE (R), has seen her favorable ratings drop substantially in recent months. Today, 43 percent of Arizona voters see her favorably, while 47 percent see her unfavorably.

But Mike Noble, OH Predictive Insights' chief of research, pointed to the number of Arizona voters who do not have an opinion of Kelly — nearly a quarter of likely voters — as an opportunity for McSally to fight back, if she can define the political neophyte early.

The race has become one of the most expensive in the country, as both Kelly and McSally prove prodigious fundraisers.

Through the end of 2019, Kelly had raised more than $20 million and had $13 million in the bank.

McSally had raised $12 million, a figure that would have been more impressive if she were running against any other Democrat in the country. She ended the year with $7.6 million on hand.

Arizona is fast becoming a battleground state in 2020, both in the race between Kelly and McSally and in the presidential contest. Arizona's demographics are changing rapidly as more voters move in from nearby states in search of high-tech jobs in the Phoenix metropolitan area.

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The OH Predictive Insights survey found just 47 percent of Arizona voters approve of the job President Trump Donald John TrumpObama calls on Senate not to fill Ginsburg's vacancy until after election Planned Parenthood: 'The fate of our rights' depends on Ginsburg replacement Progressive group to spend M in ad campaign on Supreme Court vacancy MORE is doing, while 50 percent disapprove.

Just 46 percent of Arizona voters approved of the way Trump was handling the novel coronavirus outbreak spreading across the country, while 54 percent disapproved, pollsters discovered.

Arizona voters also favor a generic Democratic candidate for Congress by a 4-point margin, 45 to 41 percent, over a generic Republican.

The poll surveyed 600 likely Arizona voters on both cellphones and landlines from March 3 to 4. It carried a margin of error of 4 percentage points.